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(x-20)+(x-15)+(x-5)+2x=360
We move all terms to the left:
(x-20)+(x-15)+(x-5)+2x-(360)=0
We add all the numbers together, and all the variables
2x+(x-20)+(x-15)+(x-5)-360=0
We get rid of parentheses
2x+x+x+x-20-15-5-360=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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