-k+18=2K+21

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Solution for -k+18=2K+21 equation: 



-k+18=2+21

We move all terms to the left:

-k+18-(2+21)=0

We add all the numbers together, and all the variables

-k+18-23=0

We add all the numbers together, and all the variables

-1k-5=0

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

-k=5

k=5/-1

k=-5

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