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2x-31+x+24+2x+x-13+2x+11+x+7=720
We move all terms to the left:
2x-31+x+24+2x+x-13+2x+11+x+7-(720)=0
We add all the numbers together, and all the variables
9x-722=0
We move all terms containing x to the left, all other terms to the right
9x=722
x=722/9
x=80+2/9
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