-21=k+(-3)

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Solution for -21=k+(-3) equation: 



-21=k+(-3)

We move all terms to the left:

-21-(k+(-3))=0



We calculate terms in parentheses: -(k+(-3)), so:

k+(-3)

We add all the numbers together, and all the variables

k-3

Back to the equation:

-(k-3)



We get rid of parentheses

-k+3-21=0

We add all the numbers together, and all the variables

-1k-18=0

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

-k=18

k=18/-1

k=-18

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