$+7\:+\left[+1\:-\left(+10\right):\left(+5\right)\right]\:$
$y'-e^{-x}=-3y$
$2x+5=3x-8$
$\frac{\sin\:\left(90^{\circ\:\:}-x\right)}{1+\sin\:\left(x\right)}=\sec\:\left(x\right)-\tan\:\left(x\right)$
$\frac{1}{81}x^2-4>0$
$34.5+13.4$
$sinx=-cosx$
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