Question

решите уравнение 5x+2(3-4x)=2x+21

Answer 1

5x+2(3 - 4x)=2x+21
5x + 6 - 8x - 2x - 21 =0
-5x = 15
x= -3
Ответ: -3.

Answer 2

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