$-13x+62-7x+21$
$2x\:+\:3y\:=\:8$
$\lim_{x\to6}\left(\frac{4}{\left(x-6\right)^2}\right)$
$25a-30ab+15ab^2$
$\int\:\:e^{2t}dx$
$\frac{1}{secx}+sinxtanx$
$\left(7a^2b^3+5ab^2\right)^2$
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