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x-15+x-20+2x+x-5=360
We move all terms to the left:
x-15+x-20+2x+x-5-(360)=0
We add all the numbers together, and all the variables
5x-400=0
We move all terms containing x to the left, all other terms to the right
5x=400
x=400/5
x=80
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