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2x-10+2x+2x+x+x+30+x+70=720
We move all terms to the left:
2x-10+2x+2x+x+x+30+x+70-(720)=0
We add all the numbers together, and all the variables
9x-630=0
We move all terms containing x to the left, all other terms to the right
9x=630
x=630/9
x=70
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