$\int e ^ { 10 x + 3 } d x$
$20a^2+4a^2b-9b-45$
$13\:\left(-21\right)$
$\frac{-4\cdot0\cdot500}{100\cdot2}$
$20x^2-20x+25$
$15x^2+57x+36$
$\left(3d+9\right)-\left(d+2\right)$
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