12h-9=-10h-9

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Solution for 12h-9=-10h-9 equation: 



12h-9=-10h-9

We move all terms to the left:

12h-9-(-10h-9)=0

We get rid of parentheses

12h+10h+9-9=0

We add all the numbers together, and all the variables

22h=0

h=0/22

h=0

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