$$7x-6x+4x=3+14+1$$
$x = \frac{18}{5} = 3\frac{3}{5} = 3.6$
$$x+4x=3+14+1$$
$$5x=3+14+1$$
$$5x=17+1$$
$$5x=18$$
$$x=\frac{18}{5}$$
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