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2x2 - 30x - 152 = 0 simplify
x2 - 15x - 76 = 0 since -76 = -19 x 4 and -19 + 4 = -15, we have
(x + 4)(x - 19) = 0
x + 4 = 0 or x - 19 = 0
x = -4 or x = 19
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