$4+y=y$
$\frac{s}{\left(s+1\right)\left(s+1\right)}$
$x\left(x+1\right)=1$
$9x^{2}-18x+9$
$\left(wx+m\right)\left(3x+2y\right)$
$\left(x+9\right)^4\left(7x-4\right)^3$
$2,5p-1,5;\:p=0,5$
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