3a-(-8a)=-99

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Solution for 3a-(-8a)=-99 equation: 


Simplifying
3a + -1(-8a) = -99

Remove parenthesis around (-8a)
3a + -1 * -8a = -99

Multiply -1 * -8
3a + 8a = -99

Combine like terms: 3a + 8a = 11a
11a = -99

Solving
11a = -99

Solving for variable 'a'.

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

Divide each side by '11'.
a = -9

Simplifying
a = -9

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