(90-x)+2x=180

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Solution for (90-x)+2x=180 equation: 



(90-x)+2x=180

We move all terms to the left:

(90-x)+2x-(180)=0

We add all the numbers together, and all the variables

(-1x+90)+2x-180=0

We add all the numbers together, and all the variables

2x+(-1x+90)-180=0

We get rid of parentheses

2x-1x+90-180=0

We add all the numbers together, and all the variables

x-90=0

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

x=90

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