$-12a^2+9ab=-3a$
$-5\cdot\left(9-5\right)$
$6-7+8+2$
$\frac{d}{dx}2a-bx$
$-7\cdot\left(-2.7\right)$
$\frac{x}{-3}-11=-20$
$\frac{5.6^5}{5.6^3}$
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