-12-3h=30-h

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Solution for -12-3h=30-h equation: 



-12-3h=30-h

We move all terms to the left:

-12-3h-(30-h)=0

We add all the numbers together, and all the variables

-3h-(-1h+30)-12=0

We get rid of parentheses

-3h+1h-30-12=0

We add all the numbers together, and all the variables

-2h-42=0

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

-2h=42

h=42/-2

h=-21

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