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90=13x-7
We move all terms to the left:
90-(13x-7)=0
We get rid of parentheses
-13x+7+90=0
We add all the numbers together, and all the variables
-13x+97=0
We move all terms containing x to the left, all other terms to the right
-13x=-97
x=-97/-13
x=7+6/13
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