90=x+70

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Solution for 90=x+70 equation: 



90=x+70

We move all terms to the left:

90-(x+70)=0

We get rid of parentheses

-x-70+90=0

We add all the numbers together, and all the variables

-1x+20=0

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

-x=-20

x=-20/-1

x=+20

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