$$0.3x(0.2x-y)-4y(x+0.3y)+0.5x(y-x)$$
$-\frac{19xy}{5}-\frac{6y^{2}}{5}-\frac{11x^{2}}{25}$
$$0.06x^{2}-0.3xy-4y\left(x+0.3y\right)+0.5x\left(y-x\right)$$
$$0.06x^{2}-0.3xy-4y\left(x+0.3y\right)+0.5xy-0.5x^{2}$$
$$0.06x^{2}-0.3xy-4yx-1.2y^{2}+0.5xy-0.5x^{2}$$
$$0.06x^{2}-4.3xy-1.2y^{2}+0.5xy-0.5x^{2}$$
$$0.06x^{2}-3.8xy-1.2y^{2}-0.5x^{2}$$
$$-0.44x^{2}-3.8xy-1.2y^{2}$$
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