$w^2\:-4w-12\:=\:0$
$-4m^7x+12m^5xn^2-28m^3xn^4$
$\frac{6x^2}{2x}$
$2a^2-6a+4$
$\csc^2x\sec x+\csc x\cot x$
$\frac{2a^3+1}{a-1}$
$x^2-7^3-1$
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