a-(-2a)=15

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Solution for a-(-2a)=15 equation: 


Simplifying
a + -1(-2a) = 15

Remove parenthesis around (-2a)
a + -1 * -2a = 15

Multiply -1 * -2
a + 2a = 15

Combine like terms: a + 2a = 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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