3h+9=21

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Solution for 3h+9=21 equation: 



3h+9=21

We move all terms to the left:

3h+9-(21)=0

We add all the numbers together, and all the variables

3h-12=0

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

3h=12

h=12/3

h=4

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