c)
7(x-5)+5=(-15)
7x - 30 = -15 |+30
7x = 15 |/15
x = 7/15
d)
2x + 8 - x = -4x + 11 |-8
x = -4x + 3 |+4x
5x = 3 |/5
x = 3/5
e)
6x - 9 = 2x + 7 |+9
6x = 2x + 16 |-2x
4x = 16 |/4
x = 4
