$25x^2+90+81$
$9x^2-25=\left(3x+5y\right)\left(3x-5y\right)$
$\frac{d}{dx}\left(e^{x^2-y^2}+\frac{x}{y}-2=0\right)$
$ln\left(2y-5\right)+ln\left(2\right)=5x+ln\left(5x\right)$
$sin\left(3b\right)=0$
$8x+5-3x-2$
$\left(x\:-\:50\right)\:.\:\left(x\:-\:32\right)$
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