3k-5=7k-21=

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Solution for 3k-5=7k-21= equation: 



3k-5=7k-21=

We move all terms to the left:

3k-5-(7k-21)=0

We get rid of parentheses

3k-7k+21-5=0

We add all the numbers together, and all the variables

-4k+16=0

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

-4k=-16

k=-16/-4

k=+4

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