90=a+85+83

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Solution for 90=a+85+83 equation: 



90=a+85+83

We move all terms to the left:

90-(a+85+83)=0

We add all the numbers together, and all the variables

-(a+168)+90=0

We get rid of parentheses

-a-168+90=0

We add all the numbers together, and all the variables

-1a-78=0

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

-a=78

a=78/-1

a=-78

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