$\frac{19.6}{2}$
$2^2\cdot3^2$
$-6+3\left(3-10\right)$
$\left(x-3\right)^2-3\left(x+2\right)^2+2x^2-11$
$\frac{1}{y-2\:}=\frac{2y+1}{y^2-4}$
$\left(x-5n\right)^3$
$10a+20$
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