Question

решите уравнение 5x+2(3-4x)=2x+21

Answer 1

5x+6-8x-2x=21
-5x=21-6
-5x=15
5x=-15
x=-3
Ответ: -3

Answer 2

5х + 6 - 8х = 2х + 21
5х - 8х - 2х = 21 - 6
5х = -15
х=-15:5
х=-3