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2x+3+5x-7+x+20=180
We move all terms to the left:
2x+3+5x-7+x+20-(180)=0
We add all the numbers together, and all the variables
8x-164=0
We move all terms containing x to the left, all other terms to the right
8x=164
x=164/8
x=20+1/2
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