7k-21=-14k+21

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Solution for 7k-21=-14k+21 equation: 



7k-21=-14k+21

We move all terms to the left:

7k-21-(-14k+21)=0

We get rid of parentheses

7k+14k-21-21=0

We add all the numbers together, and all the variables

21k-42=0

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

21k=42

k=42/21

k=2

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