$5\left(a-1\right)\left(a+3\right)$
$x^2+3x+15$
$\frac{\left(-5pq^{2}r^{-6}\right)^{2}}{\left(3p^{2}qr-4\right)^{3}}$
$\sqrt{6x}+4\sqrt{24x}+5\sqrt{216x}$
$\left[\left(6-10\right)+\left(2-5\right)\right]-\left[\left(7+3-5\right)-\left(8-11\right)\right]$
$2x^7+\left(6x^6\right)$
$2\left(-2\right)^2\left(-1\right)^3-5\left(-2\right)\left(-1\right)+10\left(-2\right)^2\left(3\right)^3-15\left(-1\right)\left(3\right)^2$
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