$\frac{9x+3}{5x+4}$
$42-2^5:2\cdot5$
$\left(-423\right)\cdot\left(-22\right)+\left(-423\right)\cdot\left(-78\right)$
$3ab+9ab-7ab$
$\left(-10\right)-5-17-\left(-2\right)$
$2+-19$
$\frac{dy}{dx}x\sin\left(y\right)+y\sin\left(x\right)$
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