$$16=12(x+5)+5-x$$
$x = -\frac{49}{11} = -4\frac{5}{11} \approx -4.454545455$
$$16=12x+60+5-x$$
$$16=12x+65-x$$
$$16=11x+65$$
$$11x+65=16$$
$$11x=16-65$$
$$11x=-49$$
$$x=\frac{-49}{11}$$
$$x=-\frac{49}{11}$$
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