Question

сколько будет 2(x-7)+(x-7)+x=99

Answer 1

2х - 14 + х - 7 + х = 99
4х - 21 = 99
4х = 120
х = 30 

Answer 2

2(х-7)+(х-7)+х=99
2х-14+х-7+х=99
4х-21=99
4х=99+21
4х=120
х=120/4
х=30