3h+21=9-3h

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



3h+21=9-3h

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3h+3h-9+21=0

We add all the numbers together, and all the variables

6h+12=0

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

6h=-12

h=-12/6

h=-2

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