\(a,2.\left(x-5\right)-3.\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(x=-31-14\)
\(x=-45\)
\(b,5.\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36=12\)
\(3x=12+36\)
\(3x=48\)
\(x=16\)
\(c,-5.\left(2-x\right)+4.\left(x-3\right)=10.x-15\)
\(-10+5x+4x-12=10x-15\)
\(-6x-22=10x-15\)
\(-6x-10x=-15+22\)
\(-16x=7\)
\(x=-\frac{7}{16}\)
Câu d , e f tương tự nha
Trả lời:
a, 2 ( x - 5 ) - 3 ( x + 7 ) = 14
=> 2x - 10 - 3x - 21 = 14
=> - x - 31 = 14
=> - x = 45
=> x = - 45
Trả lời:
b, 5 ( x - 6 ) - 2 ( x + 3 ) = 12
=> 5x - 30 - 2x - 6 = 12
=> 3x - 36 = 12
=> 3x = 48
=> x = 16
Trả lời:
c, - 5 ( 2 - x ) + 4 ( x - 3 ) = 10x - 15
=> - 10 + 5x + 4x - 12 = 10x - 15
=> 9x - 22 = 10x - 15
=> 9x - 10x = -15 + 22
=> - x = 7
=> x = - 7
Trả lời:
d, - 7 ( 3x - 5 ) + 2 ( 7x - 14 ) = 28
=> - 21x + 35 + 14x - 28 = 28
=> - 7x + 7 = 28
=> - 7x = 21
=> x = - 3
Trả lời:
e, 5 ( 4 - x ) - 7 ( - x + 2 ) = 4 - 9 + 3
=> 20 - 5x + 7x - 14 = - 2
=> 2x + 6 = - 2
=> 2x = -8
=> x = - 4
Trả lời:
f, - 4 ( 2x + 1 ) + 8 ( 3 - 2x ) = 24
=> - 8x - 4 + 24 - 16x = 24
=> - 24x + 20 = 24
=> - 24x = 4
=> x = -1/6