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21/x=13
We move all terms to the left:
21/x-(13)=0
Domain of the equation: x!=0We multiply all the terms by the denominator
x∈R
-13*x+21=0
We add all the numbers together, and all the variables
-13x+21=0
We move all terms containing x to the left, all other terms to the right
-13x=-21
x=-21/-13
x=1+8/13
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