x = ^{4}/_{y }^{4}/_{y} + y = 54 + y^{2} = 5y y^{2} − 5y + 4 =0y^{2} − y − 4y + 4 = 0y(y−1) − 4(y −1) = 0(y − 4)(y−1) = 0y = 4 ; y = 1 x = 1 x = 4

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