Question

1) 3(x-5)=2(x+4) 2) 3(5-x) +13=4(3x-8) 3) 4(2x+3) - 5(5-4x)=(2-3x) (-9)

Answer 1

1) 3 ( х - 5 ) = 2 ( х + 4 )

3х - 15 = 2х + 8

3х - 2х = 8 + 15

х = 23

Ответ : 23

2) 3 ( 5 - х ) + 13 = 4 ( 3х - 8 )

15х - 3х + 13 = 12х - 32

15х - 12х = - 32 - 13

3х = - 45

х = - 45 / 3

х = - 15

Ответ : - 15

3) 4 ( 2х + 3 ) - 5 ( 5 - 4х ) = ( 2 - 3х ) • ( - 9 )

8х + 12 - 25 + 20х = - 18 + 27х

28х - 27х = - 18 - 12 + 25

х = - 5

Ответ : - 5