4.5k+3=21

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Solution for 4.5k+3=21 equation: 



4.5k+3=21

We move all terms to the left:

4.5k+3-(21)=0

We add all the numbers together, and all the variables

4.5k-18=0

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

4.5k=18

k=18/4.5

k=4

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