A)7x - 8 + 2x = 4x + 17
7x + 2x - 4x = 17 + 8
5x = 25
x = 25 / 5
x = 5
.
B)21 + 10x - 19 = 7x + 30 - 4x
10x - 7x + 4x = 30 + 19 - 21
7x = 28
x = 28 / 7
x = 4
.
C)5(x + 2) + 2x = 4x + 31
5x + 10 + 2x = 4x + 31
5x + 2x - 4x = 31 - 10
3x = 21
x = 21 / 3
x = 7
.
D)3(x + 7) + 2(x + 3) = x + 39
3x + 21 + 2x + 6 = x + 39
3x + 2x - x = 39 - 21 - 6
4x = 12
x = 12 / 4
x = 3
.
E)4(3x + 1) - x = 3x + 20
12x + 4 - x = 3x + 20
12x - x - 3x = 20 - 4
8x = 16
x = 16 / 8
x = 2
.
F)2 (3 + 6x) - 5 = 7(x + 8)
6 + 12x - 5 = 7x + 56
12x - 7x = 56 + 5 - 6
5x = 55
x = 55 / 5
x = 11.