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x2 + 36 = 20x

so x2 - 20x + 36 = 0

so x2 - 2x - 18x + 36 = 0 or x(x - 2) - 18(x - 2) = 0

that is (x - 2)(x - 18) = 0 so x - 2 = 0 or x - 18 = 0 ie x = 2 or x = 18

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