5a-8a=-9

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Solution for 5a-8a=-9 equation: 


Simplifying
5a + -8a = -9

Combine like terms: 5a + -8a = -3a
-3a = -9

Solving
-3a = -9

Solving for variable 'a'.

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

Divide each side by '-3'.
a = 3

Simplifying
a = 3

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