Question

3х – 7(3х – 4) = 5(2х – 7)
12 + 4(х – 3) – 2х = (5 – 3х) + 9
3х + (2х – 1) = 10

Answer 1

3х – 7(3х – 4) = 5(2х – 7)

3x - 21x + 28 = 10x - 35

3х - 21х - 10х = -35 - 28

-28х = - 63

х = 2,25

12 + 4(х – 3) – 2х = (5 – 3х) + 9

12 + 4х - 12 - 2х = 5 - 3х + 9

-5 - 9 -12 + 12 = - 3х -4x + 2x

-14 = -5x

x = 2,8

3х + (2х – 1) = 10

3x + 2x - 1 = 10

5x = 11

x = 2,2