-21=j(-7)

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Solution for -21=j(-7) equation: 



-21=j(-7)

We move all terms to the left:

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



We calculate terms in parentheses: -(j(-7)), so:

j(-7)

We multiply parentheses

-7j

Back to the equation:

-(-7j)



We get rid of parentheses

7j-21=0

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

7j=21

j=21/7

j=3

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