-10(-9+a)=-30

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Solution for -10(-9+a)=-30 equation: 


Simplifying
-10(-9 + a) = -30
(-9 * -10 + a * -10) = -30
(90 + -10a) = -30

Solving
90 + -10a = -30

Solving for variable 'a'.

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

Add '-90' to each side of the equation.
90 + -90 + -10a = -30 + -90

Combine like terms: 90 + -90 = 0
0 + -10a = -30 + -90
-10a = -30 + -90

Combine like terms: -30 + -90 = -120
-10a = -120

Divide each side by '-10'.
a = 12

Simplifying
a = 12

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