$m^3-4m^2-5m=0$
$25a^{12}-100a^{4}b^{10}$
$x^{\prime}=\frac{x+t+1}{x+t-1}$
$\frac{1}{2}.\:x.\sqrt[4]{4.x.y}$
$x^{2}-7x-1$
$-x+15=-7x+3$
$\frac{15.070}{27.400}$
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