$$2x-3x4=7x4$$
$x=5x_{4}$
$$2x=7x_{4}+3x_{4}$$
$$2x=10x_{4}$$
$$\frac{2x}{2}=\frac{10x_{4}}{2}$$
$$x=\frac{10x_{4}}{2}$$
$$x=5x_{4}$$
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$x_{4}=\frac{x}{5}$
$$2x-3x_{4}-7x_{4}=0$$
$$2x-10x_{4}=0$$
$$-10x_{4}=-2x$$
$$\frac{-10x_{4}}{-10}=-\frac{2x}{-10}$$
$$x_{4}=-\frac{2x}{-10}$$
$$x_{4}=\frac{x}{5}$$
