21=4j-(-9)

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Solution for 21=4j-(-9) equation: 



21=4j-(-9)

We move all terms to the left:

21-(4j-(-9))=0



We calculate terms in parentheses: -(4j-(-9)), so:

4j-(-9)

We add all the numbers together, and all the variables

4j+9

Back to the equation:

-(4j+9)



We get rid of parentheses

-4j-9+21=0

We add all the numbers together, and all the variables

-4j+12=0

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

-4j=-12

j=-12/-4

j=+3

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