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(7x-248)=90
We move all terms to the left:
(7x-248)-(90)=0
We get rid of parentheses
7x-248-90=0
We add all the numbers together, and all the variables
7x-338=0
We move all terms containing x to the left, all other terms to the right
7x=338
x=338/7
x=48+2/7
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