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x2-9x+18 = (x-3)(x-6) when factorised
lcd of 18 and 16 = 144
LCD(20, 6) = 60
LCD(18, 21) = 126
LCD(5, 18) = 90
18 is.
18
the LCD is 6
lcd(9, 6) = 18.
It is: 630
198
90
1800