3z + 2z
add 3 to both sides: 9 + 3 = 12, y=12
divide both sides by 2: 10 / 2 = 5, b=5
-2y + y
2m - 7m; 6 + 3
-y + 6
5z - 5
-2 + x
5n + 3
-12 = 6 - 6n; -18 = -6n; 3=n
n + 4n; 5 - 2
Subtract 1 from both sides; then divide both sides by 3; x=5
Subtract 3 from both sides; then multiply both sides by 2; x=4
-2 + 4x = -6; 4x = -4; x=-1
Add 5 to both sides; then multiply both sides by 3; x = 27
8 = 5p + 13; -5 = 5p; -1=p
-5m + 9
subtract 5 from both sides: 12 - 5 = 7, x=7
10 - 3t = -11; -3t = -21; t=7
multiply both sides by 3: 6 * 3 = 18, n=18
multiply both sides by the reciprocal 3/2: 8 * (3/2) = 12, x=12
Add 2 to both sides; then divide by 4; x=5
5 - 7
Subtract 3 from both sides; then divide both sides by 2; x=6
20 + 2g = 14; 2g = -6; g = -3