1+7(15- 3x) - (2x + 48) = -34 (5-x)+ 18(1 - 2x)

1 + 105 - 21x - 2x - 48 = -170 + 34x + 18 - 36x

-21x - 2x - 34x + 36x = -170 + 18 - 1 - 105 + 48

-21x = -210

x = -210 : (-21)

x = 10

1.Раскрываем скобки

1+105-21х-2х-48 = -170+34х+18-36х

2.Решаем

-21х-2х-34х+36х = -1-105+48-170+18

-21х = -210 / :(-21)

х= 10