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15-1/x=21
We move all terms to the left:
15-1/x-(21)=0
Domain of the equation: x!=0We add all the numbers together, and all the variables
x∈R
-1/x-6=0
We multiply all the terms by the denominator
-6*x-1=0
We add all the numbers together, and all the variables
-6x-1=0
We move all terms containing x to the left, all other terms to the right
-6x=1
x=1/-6
x=-1/6
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