-8a-(-11a)=-15

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Solution for -8a-(-11a)=-15 equation: 


Simplifying
-8a + -1(-11a) = -15

Remove parenthesis around (-11a)
-8a + -1 * -11a = -15

Multiply -1 * -11
-8a + 11a = -15

Combine like terms: -8a + 11a = 3a
3a = -15

Solving
3a = -15

Solving for variable 'a'.

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

Divide each side by '3'.
a = -5

Simplifying
a = -5

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