$\frac{3}{2-4x}\:,\:x=3$
$x+9=25$
$\int_{0}^{1}\frac{e^{x}-e^{-x}}{2}dx$
$\left(8+12i\right)^2$
$-679+-853$
$-13-\left(-3\right)\cdot\left(-9\right)+5\cdot\left(-8\right)$
$\left(\frac{ab}{2}-2a^2\right)^2$
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