-21=-7/2j

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Solution for -21=-7/2j equation: 



-21=-7/2j

We move all terms to the left:

-21-(-7/2j)=0



Domain of the equation: 2j)!=0

j!=0/1

j!=0

j∈R



We get rid of parentheses

7/2j-21=0

We multiply all the terms by the denominator


-21*2j+7=0

Wy multiply elements

-42j+7=0

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

-42j=-7

j=-7/-42

j=1/6

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