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3x2 + 2x = 16

∴ 3x2 + 2x - 16 = 0

∴ 3x2 - 6x + 8x - 16 = 0

∴ 3x(x - 2) + 8(x - 2) = 0

∴ (3x + 8)(x - 2) = 0

∴ x ∈ {-8/3, 2}

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14y ago

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