21/7=30/n

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Solution for 21/7=30/n equation: 



21/7=30/n

We move all terms to the left:

21/7-(30/n)=0



Domain of the equation: n)!=0

n!=0/1

n!=0

n∈R



We add all the numbers together, and all the variables

-(+30/n)+21/7=0

We add all the numbers together, and all the variables

-(+30/n)+3=0

We get rid of parentheses

-30/n+3=0

We multiply all the terms by the denominator


3*n-30=0

We add all the numbers together, and all the variables

3n-30=0

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

3n=30

n=30/3

n=10

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