$\log3\left(-3-2x\right)=1$
$3x+9y-x$
$\cos\left(2x\right)=\frac{3}{7}$
$f\left(x\right)=\:\frac{2x^5+3x^4-x^3+2}{x^2}$
$x-20>60$
$-4\cdot0\cdot500$
$\frac{d^2}{dx^2}\left(sin\left(x\right)-cos\left(x\right)\right)$
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