21/b=-7

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Solution for 21/b=-7 equation: 



21/b=-7

We move all terms to the left:

21/b-(-7)=0



Domain of the equation: b!=0

b∈R



We add all the numbers together, and all the variables

21/b+7=0

We multiply all the terms by the denominator


7*b+21=0

We add all the numbers together, and all the variables

7b+21=0

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

7b=-21

b=-21/7

b=-3

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