12h+-9h=-18

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Solution for 12h+-9h=-18 equation: 



12h+-9h=-18

We move all terms to the left:

12h+-9h-(-18)=0

We add all the numbers together, and all the variables

3h+18=0

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

3h=-18

h=-18/3

h=-6

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