-42=9j+21

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Solution for -42=9j+21 equation: 



-42=9j+21

We move all terms to the left:

-42-(9j+21)=0

We get rid of parentheses

-9j-21-42=0

We add all the numbers together, and all the variables

-9j-63=0

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

-9j=63

j=63/-9

j=-7

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