$$(x+2)(x+3)+(x-3)(x-2)-2x(x+7=0$$
$x=6$
$$x^{2}+5x+6+\left(x-3\right)\left(x-2\right)-2x\left(x+1\right)=0$$
$$x^{2}+5x+6+x^{2}-5x+6-2x\left(x+1\right)=0$$
$$2x^{2}+5x+6-5x+6-2x\left(x+1\right)=0$$
$$2x^{2}+6+6-2x\left(x+1\right)=0$$
$$2x^{2}+12-2x\left(x+1\right)=0$$
$$2x^{2}+12-2x^{2}-2x=0$$
$$12-2x=0$$
$$-2x=-12$$
$$x=\frac{-12}{-2}$$
$$x=6$$
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