$4n^2+n-33$
$20+4\cdot4$
$12x^2-9x^3+15x^5$
$\int3x^2\cdot\cos\left(x\right)\cdot dx$
$x^2-13x+0$
$\left(x^3-2x^2+3x-4\right)-\left(2x^3+5x^2-4x+2\right)$
$\log_{5x}\left(625\right)+\log_x\left(\frac{1}{5}-\frac{2}{3}\right)=0$
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