3=4/(u+7)

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Solution for 3=4/(u+7) equation: 



3=4/(u+7)

We move all terms to the left:

3-(4/(u+7))=0



Domain of the equation: (u+7))!=0

u∈R



We multiply all the terms by the denominator


-(4+3*(u+7))=0



We calculate terms in parentheses: -(4+3*(u+7)), so:

4+3*(u+7)

determiningTheFunctionDomain
3*(u+7)+4

We multiply parentheses

3u+21+4

We add all the numbers together, and all the variables

3u+25

Back to the equation:

-(3u+25)



We get rid of parentheses

-3u-25=0

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

-3u=25

u=25/-3

u=-8+1/3

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