Найдите корни уравнения: а)9(х-1)=х+15; б)(11х+-8)=25; в)12-4(-3)=39-9х; г)2(3х+5)-3(4х-1)=121

9x - 9 = x + 15
8x = 24
x = 3


11x + 14 - 5x + 8 = 25
6x = 25 - 22
6x = 3
x = 1/2

12+12 = 39 - 9x
24 - 39 = -9x
9x = 15
x = 15/9 = 1 2/3

6x + 10 - 12x + 3 = 121
- 6x = 121 - 13
- 6x = 108
6x = -108
x = -18