5k-15=7k+21

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Solution for 5k-15=7k+21 equation: 



5k-15=7k+21

We move all terms to the left:

5k-15-(7k+21)=0

We get rid of parentheses

5k-7k-21-15=0

We add all the numbers together, and all the variables

-2k-36=0

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

-2k=36

k=36/-2

k=-18

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