$$\frac{49}{64}x^{2}-2xy+\frac{64}{49}y^{1}$$
$-2xy+\frac{49x^{2}}{64}+\frac{64y}{49}$
$$\frac{49}{64}x^{2}-2xy+\frac{64}{49}y$$
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$\frac{2401x^{2}-6272xy+4096y}{3136}$
$$\frac{2401x^{2}-6272xy+4096y^{1}}{3136}$$
