Question

Помогите решить уравнения:1)5х=(7+8+4х)=56   2)12+3х-2х-7=29   3)4х+(15-3х)-12=26

Answer 1

1) 5х - (7 + 8 + 4х) = 56
5x - 7 - 8 - 4x = 56
5x - 4x = 56 + 8 + 7 
x = 71
2) 12 + 3x - 2x - 7 = 29 
3x - 2x = 29 - 12 + 7
x = 24
3)4x + (15 - 3x) - 12= 26
4x + 15 - 3x - 12 = 26
4x - 3x = 26 - 15 + 12
x = 23