X+2y-18=180

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Solution for X+2y-18=180 equation: 



X+2X-18=180

We move all terms to the left:

X+2X-18-(180)=0

We add all the numbers together, and all the variables

3X-198=0

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

3X=198

X=198/3

X=66

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