Решите уравнения : 1) 2x + 17 = 22 + 3x 2) 25 - 4x = 12 - 5x 3) 21x + 45 = 17 + 14x 4)...

Question

Решите уравнения :
1) 2x + 17 = 22 + 3x
2) 25 - 4x = 12 - 5x
3) 21x + 45 = 17 + 14x
4) 13x + 70 = 2 x + 15

Answer 1

1)2х+17=22+3х
2х-3х=22-17
-х=5
х=-5
2) 25-4х=12-5х
-4х+5х=12-25
х=13
3)21х+45=17-45
21х-14х=14-45
7х=-28
х=-4
4)13х+70=2х+15
13х-2х=15-70
11х=-55
х=-5