3=a+12

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Solution for 3=a+12 equation: 



3=a+12

We move all terms to the left:

3-(a+12)=0

We get rid of parentheses

-a-12+3=0

We add all the numbers together, and all the variables

-1a-9=0

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

-a=9

a=9/-1

a=-9

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