a) 3(x+7) = 2 + 5(2x-8)3x + 21 = 2 + 10x - 403x + 21 = 10x - 3838 = 7x - 217x = 59x = 59/7x = 8.4286
б) 2 - 3(2x-1) = 1 + 7(x-5)2 - 6x + 3 = 1 + 7x - 355 - 6x = 7x - 346x + 7x = 5 + 3413x = 39x = 39/13x = 3
a) 3(x+7) = 2 + 5(2x-8)
3x + 21 = 2 + 10x - 40
3x + 21 = 10x - 38
38 = 7x - 21
7x = 59
x = 59/7
x = 8.4286
б) 2 - 3(2x-1) = 1 + 7(x-5)
2 - 6x + 3 = 1 + 7x - 35
5 - 6x = 7x - 34
6x + 7x = 5 + 34
13x = 39
x = 39/13
x = 3