a-(-3a)=20

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Solution for a-(-3a)=20 equation: 


Simplifying
a + -1(-3a) = 20

Remove parenthesis around (-3a)
a + -1 * -3a = 20

Multiply -1 * -3
a + 3a = 20

Combine like terms: a + 3a = 4a
4a = 20

Solving
4a = 20

Solving for variable 'a'.

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

Divide each side by '4'.
a = 5

Simplifying
a = 5

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