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(7x+13)=124
We move all terms to the left:
(7x+13)-(124)=0
We get rid of parentheses
7x+13-124=0
We add all the numbers together, and all the variables
7x-111=0
We move all terms containing x to the left, all other terms to the right
7x=111
x=111/7
x=15+6/7
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