$\left(3x^{3}-2x-5x+8\right)+\left(6x^{3}-15x+21x^{2}-5\right)$
$y'-y\:=\:cos\:x$
$\frac{x^4-64}{x-4}$
$x-22x+121$
$n^2+6n\:+\:9$
$25x^2+10\cdot$
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