7k+21=91

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Solution for 7k+21=91 equation: 



7k+21=91

We move all terms to the left:

7k+21-(91)=0

We add all the numbers together, and all the variables

7k-70=0

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

7k=70

k=70/7

k=10

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