$3+2a;a=-5$
$4n^2+2n-6=0$
$w=\left(2a+6b\right)^2-\left(2a-6b\right)^2$
$\int\frac{x^2+1}{x^3}dx$
$7x+2mn+3mn-7x$
$\frac{-3x^4+6x^2-x+2}{x+3}$
$1,5+-0,25$
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