12=h+3h

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Solution for 12=h+3h equation: 



12=h+3h

We move all terms to the left:

12-(h+3h)=0

We add all the numbers together, and all the variables

-(+4h)+12=0

We get rid of parentheses

-4h+12=0

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

-4h=-12

h=-12/-4

h=+3

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