7k-21=2k-5

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Solution for 7k-21=2k-5 equation: 



7k-21=2k-5

We move all terms to the left:

7k-21-(2k-5)=0

We get rid of parentheses

7k-2k+5-21=0

We add all the numbers together, and all the variables

5k-16=0

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

5k=16

k=16/5

k=3+1/5

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