3h+9=6h+21

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Solution for 3h+9=6h+21 equation: 



3h+9=6h+21

We move all terms to the left:

3h+9-(6h+21)=0

We get rid of parentheses

3h-6h-21+9=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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