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X-2+X-2+X-2+X-2=180
We move all terms to the left:
X-2+X-2+X-2+X-2-(180)=0
We add all the numbers together, and all the variables
4X-188=0
We move all terms containing X to the left, all other terms to the right
4X=188
X=188/4
X=47
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