$4-2af^2+3+4af^2+5-7-3af^2$
$10\::\:\left(5-5\right)$
$3x<27$
$\left(x+3y\right)\left(4a+4x\right)$
$x^2-78x+5041$
$\frac{y}{3}+\frac{y}{5}-\frac{y}{6}$
$\left(\left(-5\right)+\left(-19\right)\right)-\left(\left(25\right)-\left(-23\right)\right)$
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