a ) \(-5\times\left(-x+7\right)-3\times\left(-x-5\right)=-4\times\left(12-x\right)+48\)

\(\Leftrightarrow5x-35+3x+15=-48+4x+48\)

\(\Leftrightarrow5x-3x+4x=35-15-48+48\)

\(\Leftrightarrow2x=20\)

\(\Leftrightarrow x=10\)

b ) \(-2\times\left(15-3x\right)-4\times\left(-7x+8\right)=-5-9\times\left(-2x+1\right)\)

\(\Leftrightarrow-30+6x-28x-32=-5+18x-9\)

\(\Leftrightarrow6x-28x-18x=30+32-5-9\)

\(\Leftrightarrow-40x=48\)

\(\Leftrightarrow x=-1.2\)

C,D nưã bạn

 c, 7 . ( - x - 7 ) - 5 . ( - x - 3 ) = 12 . ( 3 - x)

<=> - 7x - 49  + 5x  + 15 = 36 - 12x

<=>  - 2x + 12x = 36 - 15 + 49

<=> 10 x = 70

<=> x = 7

Vẫy  x = 7

d, 5 . ( - 3x - 7 ) - 4 . ( - 2x - 11 ) = 7 . ( 4x + 10) + 9

<=> - 15x + 8x + 44 = 28x + 70 + 9

<=> - 7x + 44 = 28x + 79

<=> - 7x - 28x = 79 - 44

<=> - 35x = 35

<=> x = - 1

Vậy x = - 1

Hc tốt

\(a,-5.\left(-x+7\right)-3.\left(-x-5\right)=-4.\left(12-x\right)+48\)

                          \(5x-35-3x+15=-48+4x+48\)

                                                \(2x-10=4x\)

                                                \(2x-4x=10\)

                                                       \(-2x=10\)

                                                             \(x=-5\)

 \(b,\left(-x-7\right)-5.\left(-x-3\right)=12.\left(3-x\right)\)

                  \(-x-7+5x+15=36-12x\)

                                         \(4x+8=36-12x\)

                                    \(4x+12x=36-8\)

                                               \(16x=28\)

                                                    \(x=1,75\)

các câu còn lại tương tự nha

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a) \(-5\left(-x+7\right)-3\left(-x-5\right)=-4\left(12-x\right)+48\)

\(\Leftrightarrow5x-35+3x+15=-48+4x+48\)

\(\Leftrightarrow4x=20\)

\(\Rightarrow x=5\)

b) \(-2\left(15-3x\right)-4\left(-7x+8\right)=-5-9\left(-2x+1\right)\)

\(\Leftrightarrow-30+6x+28x-32=-5+18x-9\)

\(\Leftrightarrow16x=48\)

\(\Rightarrow x=3\)

c) \(7\left(-x-7\right)-5\left(-x-3\right)=12\left(3-x\right)\)

\(\Leftrightarrow-7x-49+5x+15=36-12x\)

\(\Leftrightarrow10x=70\)

\(\Rightarrow x=7\)

d) \(5\left(-3x-7\right)-4\left(-2x-11\right)=7\left(4x+10\right)+9\)

\(\Leftrightarrow-15x-35+8x+44=28x+70+9\)

\(\Leftrightarrow35x=-70\)

\(\Rightarrow x=-2\)

e) \(-2\left(x+3\right)-15=3\left(4+2x\right)+7\)

\(\Leftrightarrow-2x-6-15=12+6x+7\)

\(\Leftrightarrow8x=-40\)

\(\Rightarrow x=-5\)

a) -5(-x + 7) - 3(-x - 5) = -4(12 - x) + 48

=> 5x - 35 + 3x + 15 = -48 + 4x + 48

=> (5x + 3x) + (-35 + 15) = (-48 + 48) + 4x

=> 8x - 20 = 4x

=> 8x - 20 - 4x = 0

=> 4x - 20 = 0

=> 4x = 20

=> x = 5

b) -2(15 - 3x) - 4(-7x + 8) = -5 - 9(-2x + 1)

=> -30 + 6x + 28x - 32 = -5 + 18x - 9

=> (-30 - 32) + (6x + 28x) = (-5 - 9) + 18x

=> -62 + 34x = -14 + 18x

=> -62 + 34x + 14 - 18x = 0

=> (-62 + 14) + (34x - 18x) = 0

=> -48 + 16x = 0

=> -48 = -16x

=> x = (-48) : (-16) = 3

c) 7(-x - 7) - 5(-x - 3) = 12(3 - x)

=> -7x - 49 + 5x + 15 = 36 - 12x

=> (-7x + 5x) + (-49 + 15) = 36 - 12x

=> -2x - 34 = 36 - 12x

=> -2x - 34 - 36 + 12x = 0

=> (-2x + 12x) + (-34 - 36) = 0

=> 10x - 70 = 0

=> 10x = 70

=> x = 7

d) 5(-3x - 7) - 4(-2x - 11) = 7(4x + 10) + 9

=> -15x - 35 + 8x + 44 = 28x + 70 + 9

=> (-15x + 8x) + (-35 + 44) = 28x + 79

=> -7x + 9 = 28x + 79

=> -7x + 9 - 28x - 79 = 0

=> (-7x - 28x) + (9 - 79) = 0

=> -35x - 70 = 0

=> -35x = 70

=> x = -2

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