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81=13x-5
We move all terms to the left:
81-(13x-5)=0
We get rid of parentheses
-13x+5+81=0
We add all the numbers together, and all the variables
-13x+86=0
We move all terms containing x to the left, all other terms to the right
-13x=-86
x=-86/-13
x=6+8/13
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