[(6a+b)(6a-b)-(9a-2b)(4a+3b)]:(-3b)
https://www.wolframalpha.com/input?i=simplify++%5B%286a--b%29%286a-b%29-%289a-2b%29%284a--3b%29%5D%2F%28-3b%29
@exprof ma come la risolvo
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