18-21k=-12-30k

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Solution for 18-21k=-12-30k equation: 



18-21k=-12-30k

We move all terms to the left:

18-21k-(-12-30k)=0

We add all the numbers together, and all the variables

-21k-(-30k-12)+18=0

We get rid of parentheses

-21k+30k+12+18=0

We add all the numbers together, and all the variables

9k+30=0

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

9k=-30

k=-30/9

k=-3+1/3

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