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2x+15+3x-30+2x-20=180
We move all terms to the left:
2x+15+3x-30+2x-20-(180)=0
We add all the numbers together, and all the variables
7x-215=0
We move all terms containing x to the left, all other terms to the right
7x=215
x=215/7
x=30+5/7
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