$x^2-5x+5$
$x^2-2x-80$
$x-5\sin3x^2$
$1-4\:.+16\:+55$
$x^2+x-\frac{20}{x+5}$
$-5\cdot\left(-10+3\right)\cdot\left(+9-4\right)+\left(+11-10\right)$
$\frac{-2+3\cdot2}{2}$
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