72=9s+3s

Solution for 72=9s+3s equation:

Simplifying
72 = 9s + 3s

Combine like terms: 9s + 3s = 12s
72 = 12s

Solving
72 = 12s

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Add '-12s' to each side of the equation.
72 + -12s = 12s + -12s

Combine like terms: 12s + -12s = 0
72 + -12s = 0

Add '-72' to each side of the equation.
72 + -72 + -12s = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -12s = 0 + -72
-12s = 0 + -72

Combine like terms: 0 + -72 = -72
-12s = -72

Divide each side by '-12'.
s = 6

Simplifying
s = 6