90=56+a

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Solution for 90=56+a equation: 



90=56+a

We move all terms to the left:

90-(56+a)=0

We add all the numbers together, and all the variables

-(a+56)+90=0

We get rid of parentheses

-a-56+90=0

We add all the numbers together, and all the variables

-1a+34=0

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

-a=-34

a=-34/-1

a=+34

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