$\left(-30\right):\left(+1\right)$
$\left(x^2+2x-1\right)\cdot\left(x^2+2x-1\right).\left(x^2+2x-1\right)$
$4x^2-12x+2$
$2x+4y-5z=9$
$\left(7x+20y\right)^2$
$\left(5x^{3\:}3y\right)^2$
$y''+y'+1.25y=0$
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