$81+11k-7k-9$
$\frac{d}{dx}\sqrt{\frac{x-1}{x^8+3}}$
$3x^2+4x+4-\frac{5}{3x-5}$
$\sin\:\left(x\right)-\sqrt{3}\cos\:\left(x\right)=1$
$\frac{1}{3}+\:m^3\:\:^3$
$a^2\:-\:b^2,\:a\:=\:1$
$x^2+5x-60=0$
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