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(3h-4)(3h-4)(9h-12)=3993
We move all terms to the left:
(3h-4)(3h-4)(9h-12)-(3993)=0
We multiply parentheses ..
(+9h^2-12h-12h+16)(9h-12)-3993=0
We move all terms containing h to the left, all other terms to the right
(+9h^2-12h-12h+16)(9h-12)=3993
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