80=x+90

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Solution for 80=x+90 equation: 



80=x+90

We move all terms to the left:

80-(x+90)=0

We get rid of parentheses

-x-90+80=0

We add all the numbers together, and all the variables

-1x-10=0

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

-x=10

x=10/-1

x=-10

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