Question

Решите уравнение:
5x+2(3-4x)=2x+21

Answer 1

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

Answer 2

5x+2(3-4x)=2x+21
5х+6-8х=2х+21
5х-8х-2х=21-6
-5х=15
5х= -15
х= -15:5
х= -3