$\frac{x}{3^{-1}}-1$
$5+2+1+-5$
$3\left(-4\right)+5-3+8-3\left(-2\right)+5$
$6.0003\cdot10^2$
$\left(-3m^2n\right)\left(-5mn^3\right)$
$\frac{cosa}{1+sina}+\frac{\left(1+sina\right)}{cosa}=2seca$
$16f^2\:+\:50f\:+\:25$
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