$$3\ x2+4x+5=0$$
$x=\frac{-3x_{2}-5}{4}$
$$4x+5=-3x_{2}$$
$$4x=-3x_{2}-5$$
$$\frac{4x}{4}=\frac{-3x_{2}-5}{4}$$
$$x=\frac{-3x_{2}-5}{4}$$
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$x_{2}=\frac{-4x-5}{3}$
$$3x_{2}+5=-4x$$
$$3x_{2}=-4x-5$$
$$\frac{3x_{2}}{3}=\frac{-4x-5}{3}$$
$$x_{2}=\frac{-4x-5}{3}$$
