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x+6x+(x+10)=684
We move all terms to the left:
x+6x+(x+10)-(684)=0
We add all the numbers together, and all the variables
7x+(x+10)-684=0
We get rid of parentheses
7x+x+10-684=0
We add all the numbers together, and all the variables
8x-674=0
We move all terms containing x to the left, all other terms to the right
8x=674
x=674/8
x=84+1/4
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