-3+(15+a)=12

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Solution for -3+(15+a)=12 equation: 



-3+(15+a)=12

We move all terms to the left:

-3+(15+a)-(12)=0

We add all the numbers together, and all the variables

(a+15)-3-12=0

We add all the numbers together, and all the variables

(a+15)-15=0

We get rid of parentheses

a+15-15=0

We add all the numbers together, and all the variables

a=0

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