$\frac{d^2}{dx^2}\left(2x^3-3y^2\right)$
$10a-15b$
$800\:-\:15$
$\left(\frac{2}{3}b^3-\frac{5}{2}b^2c\right)^2$
$\left(-x\cdot x\right)\left(y^2\cdot y^3\right)\left(m\right)\left(-5\right)$
$\left(-x+5\right)\cdot\left(-9x-54+\frac{270}{-x+5}\right)$
$2\:a^2b\:c^3\:y;\:a=2,\:b=3,c=1$
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