30=12+k

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Solution for 30=12+k equation: 



30=12+k

We move all terms to the left:

30-(12+k)=0

We add all the numbers together, and all the variables

-(k+12)+30=0

We get rid of parentheses

-k-12+30=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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