$$5 x ( x - 6 y ) + ( x + 3 y ) ( 3 x - 4 y )$$
$8x^{2}-25xy-12y^{2}$
$$5x^{2}-30xy+\left(x+3y\right)\left(3x-4y\right)$$
$$5x^{2}-30xy+3x^{2}-4xy+9yx-12y^{2}$$
$$5x^{2}-30xy+3x^{2}+5xy-12y^{2}$$
$$8x^{2}-30xy+5xy-12y^{2}$$
$$8x^{2}-25xy-12y^{2}$$
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