$2t+4>50$
$446\cdot765$
$-44\cdot26$
$\left(\frac{x}{2}+3\right)^4$
$\frac{x^3-1}{x^5-6x^4+12x^3-8x^2}$
$-\frac{3}{2}m^2n;\:m=2;\:n=-7$
$a^2-6a-91=0$
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