90=x+x+10+x+20

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Solution for 90=x+x+10+x+20 equation: 



90=x+x+10+x+20

We move all terms to the left:

90-(x+x+10+x+20)=0

We add all the numbers together, and all the variables

-(3x+30)+90=0

We get rid of parentheses

-3x-30+90=0

We add all the numbers together, and all the variables

-3x+60=0

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

-3x=-60

x=-60/-3

x=+20

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