-9+9a=-90

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Solution for -9+9a=-90 equation: 


Simplifying
-9 + 9a = -90

Solving
-9 + 9a = -90

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 + 9a = -90 + 9

Combine like terms: -9 + 9 = 0
0 + 9a = -90 + 9
9a = -90 + 9

Combine like terms: -90 + 9 = -81
9a = -81

Divide each side by '9'.
a = -9

Simplifying
a = -9

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