$2-\left(-5\right)-16+\left(-20\right)$
$\log\left(\frac{\sqrt{x}}{\sqrt[3]{y}}\right)$
$-3\cdot2x^2$
$3x-5\le\:5x+3$
$5xy-6xy^2+3xy+9x^2y$
$12\cos^2\left(x\right)-7\sin\left(x\right)-13$
$\frac{d^2}{dx^2}\left(4x^2-e^x\right)$
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