Пошаговое объяснение:
1)
6 x = 28 - x
7 x - 28 = 0
x = 4
2)
9×(-26) = 30 - 5 x
-234 = 30 - 5 x
5 x = 264
x = 52.8
3)
7 - 3 x = 6 x - 56
63 - 9 x = 0
x = 7
4)
5 (x - 4) = x + 8
4 x - 28 = 0
x = 7
5)
9 - 7 (x + 3) = 5 - 6
-7 x - 12 = -1
-7 x - 11 = 0
x = 1.57142857143
