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(2x+10)+(2x+30)=684
We move all terms to the left:
(2x+10)+(2x+30)-(684)=0
We get rid of parentheses
2x+2x+10+30-684=0
We add all the numbers together, and all the variables
4x-644=0
We move all terms containing x to the left, all other terms to the right
4x=644
x=644/4
x=161
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