21=7j-(-j-5)

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Solution for 21=7j-(-j-5) equation: 



21=7j-(-j-5)

We move all terms to the left:

21-(7j-(-j-5))=0

We add all the numbers together, and all the variables

-(7j-(-1j-5))+21=0



We calculate terms in parentheses: -(7j-(-1j-5)), so:

7j-(-1j-5)

We get rid of parentheses

7j+1j+5

We add all the numbers together, and all the variables

8j+5

Back to the equation:

-(8j+5)



We get rid of parentheses

-8j-5+21=0

We add all the numbers together, and all the variables

-8j+16=0

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

-8j=-16

j=-16/-8

j=+2

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