$3x^2+3y^2+15x-15y+1=0$
$\lim_{x\to\infty}\left(\frac{5}{6}\right)^x$
$20\:.\:3,14$
$\left(p+2r\right)\left(p-6\right)$
$-25:-5$
$n\:2-\:3n\:+\:8\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:if\:n\:=\:4\:$
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