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12.20h=90.45
We move all terms to the left:
12.20h-(90.45)=0
We add all the numbers together, and all the variables
12.20h-90.45=0
We move all terms containing h to the left, all other terms to the right
12.20h=90.45
h=90.45/12.20
h=7+4.8095238095238/11.619047619047
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