3a-a+3a=15

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Solution for 3a-a+3a=15 equation: 


Simplifying
3a + -1a + 3a = 15

Combine like terms: 3a + -1a = 2a
2a + 3a = 15

Combine like terms: 2a + 3a = 5a
5a = 15

Solving
5a = 15

Solving for variable 'a'.

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

Divide each side by '5'.
a = 3

Simplifying
a = 3

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