$y''+225y=0$
$u^2+18u+81$
$8x^2-2x-3$
$\left(3x^2+5\right)^2$
$x^2-5x-14\le0$
$\left(+6\cdot685\cdot264\right)+\left(-72\right)$
$\frac{x^2-x-6}{x+3}$
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