90=142+a

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Solution for 90=142+a equation: 



90=142+a

We move all terms to the left:

90-(142+a)=0

We add all the numbers together, and all the variables

-(a+142)+90=0

We get rid of parentheses

-a-142+90=0

We add all the numbers together, and all the variables

-1a-52=0

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

-a=52

a=52/-1

a=-52

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