Question

Решите уравнений;
1) 4(5+2)=10(2х-3)+15
2) 2(7х-6)=7(2х-3)+7

Answer 1

1. 4 * (5х + 2) = 10 * (2х - 3) + 15

4 * 5х + 4 * 2 = 10*2х - 10 * 3 + 15

20х + 8 = 20х - 30 + 15

20х - 20х = - 30 - 8 + 15

х = - 38 + 15

х = - 23

2. 2 * (7х - 6) = 7 * (2х - 3) + 7

2 * 7х - 2 * 6 = 7 * 2х - 7 * 3 + 7

14х - 12 = 14х - 21 + 7

14х - 14х = - 21 + 12 + 7

х = - 21 + 19

х = - 2