a+15=3(a-1)

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Solution for a+15=3(a-1) equation: 



a+15=3(a-1)

We move all terms to the left:

a+15-(3(a-1))=0



We calculate terms in parentheses: -(3(a-1)), so:

3(a-1)

We multiply parentheses

3a-3

Back to the equation:

-(3a-3)



We get rid of parentheses

a-3a+3+15=0

We add all the numbers together, and all the variables

-2a+18=0

We move all terms containing a to the left, all other terms to the right

-2a=-18

a=-18/-2

a=+9

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