20=k+15

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Solution for 20=k+15 equation: 



20=k+15

We move all terms to the left:

20-(k+15)=0

We get rid of parentheses

-k-15+20=0

We add all the numbers together, and all the variables

-1k+5=0

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

-k=-5

k=-5/-1

k=+5

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