$\left(-15\right).2+20$
$-23\cdot4$
$\frac{3x^3y-5xy+2xy^2}{x-3}$
$\frac{dy}{dx}=x^3e^{x^4}$
$-4f^4+3f^3+f^2$
$35+30s-45t$
$a^2x^2-2axby+b^2y^2$
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