x(4x^2 -100)/4x(x-5)
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(8x + 3) (x – 5) = 4x (2x – x) ⇒ 8x2 – 40x + 3x – 15 = 8x2 – 16x ⇒ – 40x + 3x + 16x = 15 ⇒ – 21x = 15 ⇒ x = - 15/21 ⇒ x = - 5/3
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