$-68\:-7\:4$
$24\left(2\right)^2\left(3\right)^3\left(-4\right)$
$133-\left(-7\right)$
$\frac{x}{2}^2-\frac{1}{3x}^8$
$\left(3a^4-3\right)^2$
$6x+4y=400$
$\frac{1+\senx}{\cos x}+\frac{\cos x}{7+\senx}=2\sec x$
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