$\frac{5ab}{-2a}$
$-9x\:-\:x\:+\:3\:+\:5$
$2xy^2+5x-8xy+8y+4xy^2-4xy$
$x^4+6x^2+90$
$x^2+36-10$
$\:9x-8y-5y$
$\lim_{x\to+\infty}\left(\frac{x^3+3x+1}{2x^4+2x^2+1}\right)$
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