$\frac{x^2+2x-15}{x^2-4x+3}$
$2x+5<6$
$4x^2-x-6=0$
$x+128=989$
$y'+y^5sin\left(x\right)=0$
$y'\:=\frac{-x}{y-2x}$
$xy^2-y=0$
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