21=2k+3

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Solution for 21=2k+3 equation: 



21=2k+3

We move all terms to the left:

21-(2k+3)=0

We get rid of parentheses

-2k-3+21=0

We add all the numbers together, and all the variables

-2k+18=0

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

-2k=-18

k=-18/-2

k=+9

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