$-68\:-7\:4$
$\left(x^2+-2y\right)^3$
$\left(\frac{3}{4}y+\frac{1}{6}\right)\left(\frac{3}{4}y-\frac{5}{8}\right)$
$m^2+12^2$
$6^3\cdot6^{-2}$
$-9\left(8x-5\right)-9\left(5x+2\right)$
$\sin=\sqrt{2}-\cos$
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