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2x+3x-20+2x+3x-20=360
We move all terms to the left:
2x+3x-20+2x+3x-20-(360)=0
We add all the numbers together, and all the variables
10x-400=0
We move all terms containing x to the left, all other terms to the right
10x=400
x=400/10
x=40
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