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651/n=21
We move all terms to the left:
651/n-(21)=0
Domain of the equation: n!=0We multiply all the terms by the denominator
n∈R
-21*n+651=0
We add all the numbers together, and all the variables
-21n+651=0
We move all terms containing n to the left, all other terms to the right
-21n=-651
n=-651/-21
n=+31
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