Пошаговое объяснение:
1)
3х+2(5-2х)=х-9
3x + 10 - 4x = x - 9
-x + 10 = x - 9
x + x = 10 + 9
2x = 19
x = 19 : 2
x = 9,5
2)
5х=26+(17-2х)×3
5x = 26 + 51 - 6x
5x = 77 - 6x
5x + 6x = 77
11x = 77
x = 77:11
x = 7
Пошаговое объяснение:
1)
3х+2(5-2х)=х-9
3x + 10 - 4x = x - 9
-x + 10 = x - 9
x + x = 10 + 9
2x = 19
x = 19 : 2
x = 9,5
2)
5х=26+(17-2х)×3
5x = 26 + 51 - 6x
5x = 77 - 6x
5x + 6x = 77
11x = 77
x = 77:11
x = 7