72=3a+6a

Solution for 72=3a+6a equation:

Simplifying
72 = 3a + 6a

Combine like terms: 3a + 6a = 9a
72 = 9a

Solving
72 = 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
72 + -9a = 9a + -9a

Combine like terms: 9a + -9a = 0
72 + -9a = 0

Add '-72' to each side of the equation.
72 + -72 + -9a = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -9a = 0 + -72
-9a = 0 + -72

Combine like terms: 0 + -72 = -72
-9a = -72

Divide each side by '-9'.
a = 8

Simplifying
a = 8