$5.3\:-\:y\:+\:4.2\:$
$8m^2n^2y^3-m^2n^2-32y^3+4$
$\left(p^2+5q\right)\left(p^2-5q\right)$
$\frac{x}{\sqrt{\left(x^2+5x+1\right)}}$
$2\left(-21\right)^2+2\left(-21\right)-5$
$5+7y-9$
$8\cdot\left(3+9\right)$
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