$15.8\cdot2.7$
$\int\:\frac{x^2+x+1}{x}dx$
$dy=\left(x-4xy\right)dx$
$-\sqrt{3}-5\cdot\sqrt{3}$
$b^2+b-72$
$4y''+4y'-24y=0$
$x^2+8x+9$
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