$2a-7a$
$y+1=4x^2-2xy$
$\int\frac{x^2-x-5}{\left(x^2+5\right)^2}dx$
$2-9\left(-5+10\right)$
$2x^2+29x+90$
$\lim_{x\to\infty}n\left(2^{sin\left(\frac{3}{n}\right)}-1\right)$
$\left(\:5x\:-\:13\right)\:\left(\:5x\:+\:13\right)$
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