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2x+15+3x-20+x+15=360
We move all terms to the left:
2x+15+3x-20+x+15-(360)=0
We add all the numbers together, and all the variables
6x-350=0
We move all terms containing x to the left, all other terms to the right
6x=350
x=350/6
x=58+1/3
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