$$50x-30=(18x+3)4$$
$x = -\frac{21}{11} = -1\frac{10}{11} \approx -1.909090909$
$$50x-30=72x+12$$
$$50x-30-72x=12$$
$$-22x-30=12$$
$$-22x=12+30$$
$$-22x=42$$
$$x=\frac{42}{-22}$$
$$x=-\frac{21}{11}$$
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