$\frac { 15 x ^ { 5 } + 21 x ^ { 2 } + 6 } { 3 x + 3 }$
$11\cdot\sqrt{1}x$
$4a^2^2$
$x^2+10x=39$
$\int_0^3\left(\frac{x}{x^2-1}\right)dx$
$\frac{4x^2-29x+25}{x-6}$
$\left[\:2\:-3\:-\:\left(2\:+8\right)\:-2+13\right]-4$
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