-4a-(-7a)=-12

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Solution for -4a-(-7a)=-12 equation: 


Simplifying
-4a + -1(-7a) = -12

Remove parenthesis around (-7a)
-4a + -1 * -7a = -12

Multiply -1 * -7
-4a + 7a = -12

Combine like terms: -4a + 7a = 3a
3a = -12

Solving
3a = -12

Solving for variable 'a'.

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

Divide each side by '3'.
a = -4

Simplifying
a = -4

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