20-12h=-19-9h

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Solution for 20-12h=-19-9h equation: 



20-12h=-19-9h

We move all terms to the left:

20-12h-(-19-9h)=0

We add all the numbers together, and all the variables

-12h-(-9h-19)+20=0

We get rid of parentheses

-12h+9h+19+20=0

We add all the numbers together, and all the variables

-3h+39=0

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

-3h=-39

h=-39/-3

h=+13

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