$5+5\cdot2+5\cdot3$
$5x+40$
$\lim_{x\to\frac{\pi}{4}}\left(25\right)$
$y^2-y=x^2-x$
$-4.905x^2+0.981x+2$
$-28:\left(-4\right)$
$\frac{x}{-2}-3=1$
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