21/x-21/x-4=-4

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Solution for 21/x-21/x-4=-4 equation: 



21/x-21/x-4=-4

We move all terms to the left:

21/x-21/x-4-(-4)=0



Domain of the equation: x!=0

x∈R



We add all the numbers together, and all the variables

21/x-21/x=0

We multiply all the terms by the denominator


21-21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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