a-(-3a)=48

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Solution for a-(-3a)=48 equation: 


Simplifying
a + -1(-3a) = 48

Remove parenthesis around (-3a)
a + -1 * -3a = 48

Multiply -1 * -3
a + 3a = 48

Combine like terms: a + 3a = 4a
4a = 48

Solving
4a = 48

Solving for variable 'a'.

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

Divide each side by '4'.
a = 12

Simplifying
a = 12

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