$\left(2x+1\right)\left(4-5x\right)$
$8x-15<5x-4$
$\frac{x-1}{x-2}=\frac{1}{2}$
$8x-56=0$
$81x^2-12x+36y^2$
$\frac{3}{tanx+secx}$
$3x^2+6y+12xy$
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