$$U=[(17+35)\times(13-4)]\div7+15$$
$U = \frac{573}{7} = 81\frac{6}{7} \approx 81.857142857$
$$U=\frac{52\left(13-4\right)}{7}+15$$
$$U=\frac{52\times 9}{7}+15$$
$$U=\frac{468}{7}+15$$
$$U=\frac{468}{7}+\frac{105}{7}$$
$$U=\frac{468+105}{7}$$
$$U=\frac{573}{7}$$
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$U≔\frac{573}{7}$
