9a=21a-72

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Solution for 9a=21a-72 equation: 


Simplifying
9a = 21a + -72

Reorder the terms:
9a = -72 + 21a

Solving
9a = -72 + 21a

Solving for variable 'a'.

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

Add '-21a' to each side of the equation.
9a + -21a = -72 + 21a + -21a

Combine like terms: 9a + -21a = -12a
-12a = -72 + 21a + -21a

Combine like terms: 21a + -21a = 0
-12a = -72 + 0
-12a = -72

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

Simplifying
a = 6

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