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10x+8x-16+6x+10+9x+4+7x+2=720
We move all terms to the left:
10x+8x-16+6x+10+9x+4+7x+2-(720)=0
We add all the numbers together, and all the variables
40x-720=0
We move all terms containing x to the left, all other terms to the right
40x=720
x=720/40
x=18
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