$\frac{x^4-3x^3+2x^2x-5}{x^2-3x+1}$
$\left(-30\right):\left[\left(+18\right):\left(-3\right)\right]$
$\frac{dx}{dt}=90-0.25x$
$2x^2-4x+6$
$\frac{a\left(b^{2}-c^{3}\right)^{2}}{\left(b^{2}+c^{3}\right)^{2}}$
$4n-8=-8$
$49m^2-42m$
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