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60+60-x+60-2x+60-3x=360
We move all terms to the left:
60+60-x+60-2x+60-3x-(360)=0
We add all the numbers together, and all the variables
-6x-120=0
We move all terms containing x to the left, all other terms to the right
-6x=120
x=120/-6
x=-20
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