$+\frac{6}{-2}$
$-5x^2-4$
$\frac{12x^2-17x-40}{4x+5}$
$42+\left(-1.64\right)$
$x^2\left(x-2\right)+\left(x-2\right)$
$\lim_{x\to0}\left(\frac{3sinx-sin3t}{3tanx-tan3x}\right)$
$4y^4+20y^2z+25z^2$
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