3a-a+4a=90

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Solution for 3a-a+4a=90 equation: 


Simplifying
3a + -1a + 4a = 90

Combine like terms: 3a + -1a = 2a
2a + 4a = 90

Combine like terms: 2a + 4a = 6a
6a = 90

Solving
6a = 90

Solving for variable 'a'.

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

Divide each side by '6'.
a = 15

Simplifying
a = 15

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