$2\left(x+4\right)\:+\:3x\:=\:5x\:+\:8\:$
$\frac{dy}{dx}=\sqrt{\frac{x}{y}}y=4x=1$
$8x+5<9$
$50x^4-30x^3+40x$
$\frac{1}{\sec\left(a\right)}=\cos\left(a\right)$
$m^2-m-2$
$\frac{3}{4}x+15x^{2}-x-2$
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