21=25-2k

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Solution for 21=25-2k equation: 



21=25-2k

We move all terms to the left:

21-(25-2k)=0

We add all the numbers together, and all the variables

-(-2k+25)+21=0

We get rid of parentheses

2k-25+21=0

We add all the numbers together, and all the variables

2k-4=0

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

2k=4

k=4/2

k=2

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