e) 5x + 21 = 3x + 35;
5x-3x = 35 - 21;
2x = 14;
x = 14 / 2;
x = 7;
f) 17 - 3x + 7x = 31 - 2x + 10;
-3x + 7x + 2x = 31 + 10 - 17;
6x = 24;
x = 24 / 6;
x = 4;
g) 2x - 12 = 2(10 - 7x);
2x - 12 = 20 - 14x;
2x + 14x = 20 + 12;
16x = 32;
x = 32 / 16;
x = 2;
h) 5x - 12 - 2(x - 1) = 3(5 - 2x) + 4x;
5x - 12 - 2x + 2 = 15 - 6x + 4x;
5x - 2x + 6x - 4x = 15 + 12 - 2;
5x = 25;
x = 25 / 5;
x = 5
e) 5x + 21 = 3x + 35;
5x-3x = 35 - 21;
2x = 14;
x = 14 / 2;
x = 7;
f) 17 - 3x + 7x = 31 - 2x + 10;
-3x + 7x + 2x = 31 + 10 - 17;
6x = 24;
x = 24 / 6;
x = 4;
g) 2x - 12 = 2(10 - 7x);
2x - 12 = 20 - 14x;
2x + 14x = 20 + 12;
16x = 32;
x = 32 / 16;
x = 2;
h) 5x - 12 - 2(x - 1) = 3(5 - 2x) + 4x;
5x - 12 - 2x + 2 = 15 - 6x + 4x;
5x - 2x + 6x - 4x = 15 + 12 - 2;
5x = 25;
x = 25 / 5;
x = 5