$x2+15x+54=0$
$8-v^3$
$10.56=-\log\left(x\right)$
$9cos^2x=-10cosx-1$
$\frac{x^2-x-2}{x+2}$
$x+x+2v$
$\frac{\left(-3x^2+2x-1\right)}{x+1}$
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