$$9-15x-6-6x=6$$
$x=-\frac{1}{7}\approx -0.142857143$
$$3-15x-6x=6$$
$$3-21x=6$$
$$-21x=6-3$$
$$-21x=3$$
$$x=\frac{3}{-21}$$
$$x=-\frac{1}{7}$$
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