$-9x^4+7x^2+5;\:x=1$
$\frac{x^{20}-1}{x^5+1}$
$4n^2+2n-6=0$
$\sin\left(x\right)=-\frac{1}{5}$
$s^2-7s-5$
$\frac{2y}{y+2}-\frac{y}{y+3}=-\frac{3}{y^2+5y+6}$
$\frac{x+3}{x^2-7x+12}$
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