-9a=-13a-72

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Solution for -9a=-13a-72 equation: 


Simplifying
-9a = -13a + -72

Reorder the terms:
-9a = -72 + -13a

Solving
-9a = -72 + -13a

Solving for variable 'a'.

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

Add '13a' to each side of the equation.
-9a + 13a = -72 + -13a + 13a

Combine like terms: -9a + 13a = 4a
4a = -72 + -13a + 13a

Combine like terms: -13a + 13a = 0
4a = -72 + 0
4a = -72

Divide each side by '4'.
a = -18

Simplifying
a = -18

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