a-3=3a+15

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



a-3=3a+15

We move all terms to the left:

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

We get rid of parentheses

a-3a-15-3=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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