5k+21=90

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Solution for 5k+21=90 equation: 



5k+21=90

We move all terms to the left:

5k+21-(90)=0

We add all the numbers together, and all the variables

5k-69=0

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

5k=69

k=69/5

k=13+4/5

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