19=12+a

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Solution for 19=12+a equation: 



19=12+a

We move all terms to the left:

19-(12+a)=0

We add all the numbers together, and all the variables

-(a+12)+19=0

We get rid of parentheses

-a-12+19=0

We add all the numbers together, and all the variables

-1a+7=0

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

-a=-7

a=-7/-1

a=+7

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