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

-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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