$-8+12+9-8\cdot4$
$t\cdot y'+y=0$
$\lim_{x\to x}\left(\frac{17lnx-17}{x-e}\right)$
$-4x+3y-z=16$
$1+\cos x+\cos2x=0$
$\left(6-r\right)\left(6+r\right)$
$-36\cdot4$
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