x-(x+x)=90

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Solution for x-(x+x)=90 equation: 



x-(x+x)=90

We move all terms to the left:

x-(x+x)-(90)=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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