Question

решите уравнение
5x-7=7x+9

Answer 1

5x - 7 = 7x + 9 
7x - 5x = - 7 - 9 
2x = - 16 
x = - 8

Answer 2

5х-7х=9+7
-2х=16
х=16:(-2)
х=-8