$\:6.53\:-\:\left(-4.11\right)\:+\:7.92$
$\left(3a^3b+3ab^3\right)^2$
$\frac{-6}{12}p^2q^2r^2s\:\cdot\:\frac{-2}{3}pqr^2s$
$14+200$
$-6mn\:\left(\:-4n\:+\:2m\:-\:5\right)\:-\:3n^2m\:\left(\:-2m\:+\:3n\:+\:10\right)\:$
$\lim_{x\to\infty}\left(\frac{4x^3+2x^2-3}{4x^5-7x}\right)$
$-2x-5<15$
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