x=90+2x

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Solution for x=90+2x equation: 



x=90+2x

We move all terms to the left:

x-(90+2x)=0

We add all the numbers together, and all the variables

x-(2x+90)=0

We get rid of parentheses

x-2x-90=0

We add all the numbers together, and all the variables

-1x-90=0

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

-x=90

x=90/-1

x=-90

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