$19\cdot23$
$-7-18^2-\left(-6\right)-\left(-27\right)$
$-20+-20+6$
$\left(n^4+4\right)\left(n^2-7\right)$
$\frac{dy}{dx}=\frac{x+2y}{4y-x}$
$\frac{a^3-7a^2}{3a^2+5a^2}$
$64\cdot t^2-36\cdot t^2$
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