4/12=7/d

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Solution for 4/12=7/d equation: 



4/12=7/d

We move all terms to the left:

4/12-(7/d)=0



Domain of the equation: d)!=0

d!=0/1

d!=0

d∈R



We add all the numbers together, and all the variables

-(+7/d)+4/12=0

We get rid of parentheses

-7/d+4/12=0

We calculate fractions

There is no solution for this equation

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