12+-3h=-15

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Solution for 12+-3h=-15 equation: 



12+-3h=-15

We move all terms to the left:

12+-3h-(-15)=0

We add all the numbers together, and all the variables

-3h+27=0

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

-3h=-27

h=-27/-3

h=+9

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