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120+120+120+10x+100+x=720
We move all terms to the left:
120+120+120+10x+100+x-(720)=0
We add all the numbers together, and all the variables
11x-260=0
We move all terms containing x to the left, all other terms to the right
11x=260
x=260/11
x=23+7/11
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