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78=0.5(19+12)h
We move all terms to the left:
78-(0.5(19+12)h)=0
We add all the numbers together, and all the variables
-(0.531h)+78=0
We get rid of parentheses
-0.531h+78=0
We move all terms containing h to the left, all other terms to the right
-0.531h=-78
h=-78/-0.531
h=146+0.47399999999999/0.531
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