$2x^4-3x^3-9x^2+8x+12$
$-12d-15$
$\left(7+z\right)\left(7-z\right)$
$-10+5\cdot3$
$\lim_{x\to\infty}\left(\frac{sen\left(3x\right)}{tan\left(5x\right)}\right)$
$7a^5+13a^5$
$13r+5s-2r$
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