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6x+7+x-3+3x+20=180
We move all terms to the left:
6x+7+x-3+3x+20-(180)=0
We add all the numbers together, and all the variables
10x-156=0
We move all terms containing x to the left, all other terms to the right
10x=156
x=156/10
x=15+3/5
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