$8a^3-64b^3$
$5^4\cdot5^3:5$
$2s^2+20s+51\:$
$\frac{5-3\frac{5-2x}{3}}{2}$
$4\csc\left(2x\right)\sin\left(x\right)$
$25x^2-30x+225$
$\frac{2x^3-9x^2+4x+15}{-3x}$
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