6a-9=-99

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Solution for 6a-9=-99 equation: 


Simplifying
6a + -9 = -99

Reorder the terms:
-9 + 6a = -99

Solving
-9 + 6a = -99

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 6a = -99 + 9

Combine like terms: -9 + 9 = 0
0 + 6a = -99 + 9
6a = -99 + 9

Combine like terms: -99 + 9 = -90
6a = -90

Divide each side by '6'.
a = -15

Simplifying
a = -15

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