3a-9a=-123

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Solution for 3a-9a=-123 equation: 


Simplifying
3a + -9a = -123

Combine like terms: 3a + -9a = -6a
-6a = -123

Solving
-6a = -123

Solving for variable 'a'.

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

Divide each side by '-6'.
a = 20.5

Simplifying
a = 20.5

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