9a-5a=-20

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Solution for 9a-5a=-20 equation: 


Simplifying
9a + -5a = -20

Combine like terms: 9a + -5a = 4a
4a = -20

Solving
4a = -20

Solving for variable 'a'.

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

Divide each side by '4'.
a = -5

Simplifying
a = -5

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