X+(2x-81)=180

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Solution for X+(2x-81)=180 equation: 



X+(2X-81)=180

We move all terms to the left:

X+(2X-81)-(180)=0

We get rid of parentheses

X+2X-81-180=0

We add all the numbers together, and all the variables

3X-261=0

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

3X=261

X=261/3

X=87

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