12/x+1=21/x+4

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Solution for 12/x+1=21/x+4 equation: 



12/x+1=21/x+4

We move all terms to the left:

12/x+1-(21/x+4)=0



Domain of the equation: x!=0

x∈R





Domain of the equation: x+4)!=0

x∈R



We get rid of parentheses

12/x-21/x-4+1=0

We multiply all the terms by the denominator


-4*x+1*x+12-21=0

We add all the numbers together, and all the variables

-3x-9=0

We move all terms containing x to the left, all other terms to the right

-3x=9

x=9/-3

x=-3

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