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

3x-90=0

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

3x=90

x=90/3

x=30

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