$4-\left(7+4-5\right)$
$\int_0^x\left(\frac{x}{2}\right)dx$
$\left(-\frac{1}{2}\right)\cdot\left(-2.3\right)$
$\lim_{x\to\frac{\pi}{2}}\left(-\tan\left(x\right)\right)$
$3x^2=30x-27$
$-x^2+x-48=0$
$2x-3>9$
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