$$15x=2(7x-1)+2(x-1)$$
$x=4$
$$15x=14x-2+2\left(x-1\right)$$
$$15x=14x-2+2x-2$$
$$15x=16x-2-2$$
$$15x=16x-4$$
$$15x-16x=-4$$
$$-x=-4$$
$$x=4$$
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