5.
a)
4x - 3 = 9
4x = 9 + 3
4x = 12 /:4
x = 3
b)
6x - 2 = 10x
6x - 10x = 2
-4x = 2 /:(-4)
x = -1/2
d)
3(x + 3) = 2x - 1
3x + 9 = 2x - 1
3x - 2x = -1 - 9
x = -10
e)
4x = 48 /:4
x = 12
