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(7x+13)+(83-2x)=141
We move all terms to the left:
(7x+13)+(83-2x)-(141)=0
We add all the numbers together, and all the variables
(7x+13)+(-2x+83)-141=0
We get rid of parentheses
7x-2x+13+83-141=0
We add all the numbers together, and all the variables
5x-45=0
We move all terms containing x to the left, all other terms to the right
5x=45
x=45/5
x=9
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