$\left(-3a^2b^{3\:}c\right)\left(\frac{9}{2}a^2bc^5\right)$
$3x\:+\:4x\:+\:5y\:+\:6y\:+\:7\:+\:8$
$\left(2+3x-y\right)\left(3x^2+4xy-8\right)$
$-2x^2+4x+20$
$\log_{\sqrt{2}-1}\left(\sqrt{2}-1\right)$
$x^4+2x^3-23x^2-60x$
$6-5,5$
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