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9x-31+4x+33+7x-2=180
We move all terms to the left:
9x-31+4x+33+7x-2-(180)=0
We add all the numbers together, and all the variables
20x-180=0
We move all terms containing x to the left, all other terms to the right
20x=180
x=180/20
x=9
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