Question

tìm x ∈ Z biết

a ) 4(x - 1) - ( 3x + 2 ) = 16

b) 7(x - 5 ) + 5(15 - x ) = 130

c) 30 . (x- 2 ) - 6( x - 5 ) - 22x = 100

d) x - 17 + x = x - 23

Answer 1

a)

\(4\left(x-1\right)-\left(3x+2\right)=16\)

=> 4x - 4 - 3x - 2 = 16

=> x - 6 = 16

=> x = 22

Vậy .......

b)

\(7\left(x-5\right)+5\left(15-x\right)=130\)

=> 7x - 35 + 75 - 5x = 130

=> 2x + 40 = 130

=> 2x = 90

=> x = 45

Vậy........

c)

\(30\left(x-2\right)-6\left(x-5\right)-22x=100\)

=> 30x - 60 - 6x + 30 - 22x = 100

=> 2x - 30 = 100

=> 2x = 130

=> x = 65

Vậy.....

d) \(x-17+x=x-23\)

=> 2x - 17 = x - 23

=> x = -6

Vậy .......

Answer 2

a) 4(x-1)-(3x+2)=16 b)7(x-5)+5(15-x)=130

<=>4x-4-3x-2=16 <=>7x-35+75-5x=130

<=>x-6=16 <=>2x+40=130

<=>x=22 <=>2x=90

<=>x=45

c) 30(x- 2 ) - 6( x - 5 ) - 22x = 100 d) x-17+x=x-23

<=>30x-60-6x+30-22x=100 <=>2x-x=-23+17

<=>2x-30=100 <=>x=-6

<=>2x=130

<=>x=65

Answer 3

a) 4(x-1)-(3x+2)=16

<=>4x-4-3x-2=16

<=>x-6=16

<=>x=22

c) 30(x- 2 ) - 6( x - 5 ) - 22x = 100

<=>30x-60-6x+30-22x=100

<=>2x-30=100

<=>2x=130

<=>x=65

b)7(x-5)+5(15-x)=130

<=>7x-35+75-5x=130

<=>2x+40=130

<=>2x=90

<=>x=45

d) x-17+x=x-23

<=>2x-x=-23+17

<=>x=-6

<=>2x=130

<=>x=65