7+2k=21

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Solution for 7+2k=21 equation: 



7+2k=21

We move all terms to the left:

7+2k-(21)=0

We add all the numbers together, and all the variables

2k-14=0

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

2k=14

k=14/2

k=7

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