$x-21=6$
$\frac{16}{\left(84-3\cdot q\right)\cdot\left(60-q\right)}q'=k$
$\frac{\left(1\right)}{\left(x-1\right)\left(x-3\right)}$
$\lim_{x\to3}\frac{x^2-11x+24}{x^2-6x+9}$
$\int\left(\left(x+3\right)\left(x-5\right)^5\right)dx$
$xy^3+9x^2y-3xy+4xy^3-2xy-8x^2y$
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