6a-9a=-20

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Solution for 6a-9a=-20 equation: 


Simplifying
6a + -9a = -20

Combine like terms: 6a + -9a = -3a
-3a = -20

Solving
-3a = -20

Solving for variable 'a'.

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

Divide each side by '-3'.
a = 6.666666667

Simplifying
a = 6.666666667

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