Multiply : [3x+5y/7] [2x-3y+7]

(3 x + \frac{5 y}{7}) (2 x - 3 y + 7) = 3 x (2 x - 3 y + 7) + \frac{5 y}{7} (2 x - 3 y + 7) = 6 x^{2} - 9 xy + 21 x + \frac{10 xy}{7} - \frac{15 y^{2}}{7} + 5 y = 6 x^{2} + \frac{10 xy}{7} - 9 xy + 21 x + 5 y - \frac{15 y^{2}}{7} = 6 x^{2} - \frac{53 xy}{7} + 21 x + 5 y - \frac{15 y^{2}}{7}

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