-(k+-12)=21

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Solution for -(k+-12)=21 equation: 



-(k+-12)=21

We move all terms to the left:

-(k+-12)-(21)=0

We add all the numbers together, and all the variables

-(k-12)-21=0

We get rid of parentheses

-k+12-21=0

We add all the numbers together, and all the variables

-1k-9=0

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

-k=9

k=9/-1

k=-9

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