21+12k=7k-4

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Solution for 21+12k=7k-4 equation: 



21+12k=7k-4

We move all terms to the left:

21+12k-(7k-4)=0

We get rid of parentheses

12k-7k+4+21=0

We add all the numbers together, and all the variables

5k+25=0

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

5k=-25

k=-25/5

k=-5

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