$r^2-2r-35=0$
$41-89-73$
$\left(2x+5\right)\left(2x-10\right)$
$2x^3-4x^3$
$2x^{2\:}+\:6x+1=0$
$\left(1.25\right)^2+\left(1.5\right)^2$
$y'\:+\:5x^4y\:=\:x^4$
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