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

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



X+2X+(90-X)=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

3X+(-1X+90)-180=0

We get rid of parentheses

3X-1X+90-180=0

We add all the numbers together, and all the variables

2X-90=0

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

2X=90

X=90/2

X=45

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