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8x+21+7x+6+2x+2=180
We move all terms to the left:
8x+21+7x+6+2x+2-(180)=0
We add all the numbers together, and all the variables
17x-151=0
We move all terms containing x to the left, all other terms to the right
17x=151
x=151/17
x=8+15/17
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