$\left(4ab^2+6x^3y\right)^2$
$+15-\left(-13\right)$
$\left(3m+2m\right)\left(3m+2n\right)$
$+[25+\left(+15\right)]+\left(-19\right)\right)+1-\left(18+37\right)+1$
$\lim_{x\to n}\left(\frac{x^4}{e^x}\right)$
$\frac{36x^2y-6}{72x^{-1}y^{-5}}\left(-3\right)$
$-7m\:+\:9n\:+\:13p\:-5m\:+\:14n\:-\:18p$
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