90=-12+a

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Solution for 90=-12+a equation: 



90=-12+a

We move all terms to the left:

90-(-12+a)=0

We add all the numbers together, and all the variables

-(a-12)+90=0

We get rid of parentheses

-a+12+90=0

We add all the numbers together, and all the variables

-1a+102=0

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

-a=-102

a=-102/-1

a=+102

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