$\left(n+9\right)\left(a-6\right)$
$5x^2\:+\:3\:=-8x$
$12-n=4n-3$
$\left(3x^4-7x^6\right)^3$
$-\frac{3}{4}x<-\frac{1}{2}$
$x^2+6x-5=0$
$\frac{dx}{dy}=\frac{1}{2}x+y-1$
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