12+9h=75

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Solution for 12+9h=75 equation: 



12+9h=75

We move all terms to the left:

12+9h-(75)=0

We add all the numbers together, and all the variables

9h-63=0

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

9h=63

h=63/9

h=7

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