$-1+\frac{45}{15}$
$2y^2+y-1$
$y-1y+2$
$\left(6^{7\:}\right)^6$
$28x\:-\:69xy\:-\:22y\:-\:36x\:-\:71y\:-\:40$
$\frac{1}{4}y>8$
$1+7+19+13$
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