Question

Решите уравнение- 7х-15=5х+5(2х+1)

Answer 1

7х - 15 = 5х + 5 (2х + 1)
7х - 15 = 5х + 10х + 5
7х -5х - 10х = 15 + 5
 -8х = 20     х = - 2,5

Answer 2

7х-15=5х+5(2х+1)
7х-15=5х+10х+5
7х-15-5х-10х-5=0
приводим пободные
-12х-10=0
-12х=10
х=-5\6

Answer 3

-7x - 15 = 5x + 10x + 5 -7x - 15 = 15x + 5 -7x - 15 - 5 = 15x -7x - 20 = 15x -20 = 15x + 7x -20 = 22x x = -20/22 x = -10/11

Ответ: x = -10/11