15=-3-a

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Solution for 15=-3-a equation: 



15=-3-a

We move all terms to the left:

15-(-3-a)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1a+3+15=0

We add all the numbers together, and all the variables

a+18=0

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

a=-18

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