$$15\frac{x}{4}+18\frac{2}{3}=33\frac{11}{12}$$
$x = \frac{61}{15} = 4\frac{1}{15} \approx 4.066666667$
$$45x+4\left(18\times 3+2\right)=33\times 12+11$$
$$45x+4\left(54+2\right)=33\times 12+11$$
$$45x+4\times 56=33\times 12+11$$
$$45x+224=33\times 12+11$$
$$45x+224=396+11$$
$$45x+224=407$$
$$45x=407-224$$
$$45x=183$$
$$x=\frac{183}{45}$$
$$x=\frac{61}{15}$$
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