90=x+2x-57

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Solution for 90=x+2x-57 equation: 



90=x+2x-57

We move all terms to the left:

90-(x+2x-57)=0

We add all the numbers together, and all the variables

-(3x-57)+90=0

We get rid of parentheses

-3x+57+90=0

We add all the numbers together, and all the variables

-3x+147=0

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

-3x=-147

x=-147/-3

x=+49

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