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x+120+100+120+120+(x+10)=720
We move all terms to the left:
x+120+100+120+120+(x+10)-(720)=0
We add all the numbers together, and all the variables
x+(x+10)-260=0
We get rid of parentheses
x+x+10-260=0
We add all the numbers together, and all the variables
2x-250=0
We move all terms containing x to the left, all other terms to the right
2x=250
x=250/2
x=125
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