$3b^4c-18b^3c^2+27b^2c^3$
$4x^{-3}y^3\cdot2y$
$0.037\cdot x=37$
$\left(-3x^{4}-4x^{3}-1\right)+\left(-x^{4}+4x^{3}+2x^{2}+x+1\right)$
$2x+1\ge3x-5$
$-30a^2b+25a^4+9a^4$
$\frac{a^{24}}{a^4}$
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