-21/z=-3

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Solution for -21/z=-3 equation: 



-21/z=-3

We move all terms to the left:

-21/z-(-3)=0



Domain of the equation: z!=0

z∈R



We add all the numbers together, and all the variables

-21/z+3=0

We multiply all the terms by the denominator


3*z-21=0

We add all the numbers together, and all the variables

3z-21=0

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

3z=21

z=21/3

z=7

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