a)
6x = 42 // : 6
x = 7
b)
2x − 16 = 32
2x = 32 + 16
2x = 48 // : 2
x = 24
c)
9x − 1 + 2x = 65
9x + 2x = 65 + 1
11x = 66 // : 11
x = 6
d)
14x − 9 = 6x + 31
14x - 6x = 31 + 9
8x = 40 // : 8
x = 5
e)
3x + 4 = 10x + 3
3x - 10x = 3 - 4
- 7x = -1 // : (-7)
x = [tex]\frac{1}{7}[/tex]