90=x+30+x

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Solution for 90=x+30+x equation: 



90=x+30+x

We move all terms to the left:

90-(x+30+x)=0

We add all the numbers together, and all the variables

-(2x+30)+90=0

We get rid of parentheses

-2x-30+90=0

We add all the numbers together, and all the variables

-2x+60=0

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

-2x=-60

x=-60/-2

x=+30

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