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-x/65=13
We move all terms to the left:
-x/65-(13)=0
We multiply all the terms by the denominator
-x-13*65=0
We add all the numbers together, and all the variables
-1x-845=0
We move all terms containing x to the left, all other terms to the right
-x=845
x=845/-1
x=-845
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