12-2h=h=21

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Solution for 12-2h=h=21 equation: 



12-2h=h=21

We move all terms to the left:

12-2h-(h)=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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