$-5+8z+24-17y$
$105\cdot6$
$18-18+-15$
$\lim_{x\to-3}\left(\frac{x^2-13+\left|x-1\right|}{x^2}\right)$
$^{seno^2}$
$71-\left(19\right)-\left(-38\right)+63-109$
$\frac{3x^3+3x^2+4x+21}{x+2}$
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