9h-21=21

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Solution for 9h-21=21 equation: 



9h-21=21

We move all terms to the left:

9h-21-(21)=0

We add all the numbers together, and all the variables

9h-42=0

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

9h=42

h=42/9

h=4+2/3

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