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Assume the question refers to solving the quadratic equation 6x2 +21x - 45 = 0, then :-
This equation can be factored 6x2 + 21x - 45 = (6x - 9)(x + 5) = 0
This holds true when either 6x - 9 or x + 5 = 0
When 6x - 9 = 0 then x = 9/6 = 1.5 : When x + 5 = 0 then x = -5
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