X+(x-20)+(x+89)=180

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Solution for X+(x-20)+(x+89)=180 equation: 



X+(X-20)+(X+89)=180

We move all terms to the left:

X+(X-20)+(X+89)-(180)=0

We get rid of parentheses

X+X+X-20+89-180=0

We add all the numbers together, and all the variables

3X-111=0

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

3X=111

X=111/3

X=37

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