90=a+20

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Solution for 90=a+20 equation: 



90=a+20

We move all terms to the left:

90-(a+20)=0

We get rid of parentheses

-a-20+90=0

We add all the numbers together, and all the variables

-1a+70=0

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

-a=-70

a=-70/-1

a=+70

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