$7a^2b\cdot7bc^2$
$16.15-28.5$
$3^5+-6^3+\left(-2^6\right)$
$\left(2x-3\right)\left(3x-2\right)>0$
$5-180f^2$
$y'+10xy=3x$
$3x^2+9x-30>0$
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