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(3x+7)+(11x-5)=254
We move all terms to the left:
(3x+7)+(11x-5)-(254)=0
We get rid of parentheses
3x+11x+7-5-254=0
We add all the numbers together, and all the variables
14x-252=0
We move all terms containing x to the left, all other terms to the right
14x=252
x=252/14
x=18
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