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x^{2}+5/7x-2/7 =0
x1 = 2/7 ⇒ (7x - 2) = 0
x2 = -1 ⇒ (x +1) = 0
jadi,
(7x - 2)(x + 1) = 0
7x^{2} +5x-2 = 0