90=20+x-8

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Solution for 90=20+x-8 equation: 



90=20+x-8

We move all terms to the left:

90-(20+x-8)=0

We add all the numbers together, and all the variables

-(x+12)+90=0

We get rid of parentheses

-x-12+90=0

We add all the numbers together, and all the variables

-1x+78=0

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

-x=-78

x=-78/-1

x=+78

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