$2x-3y=1$
$\frac{x-4}{x^2-2x-3}-\frac{x}{6-2x}$
$16n^{2\:}-\:9$
$12\left(-2\right)^4$
$39.30-15.60$
$\left(-10+9v\right)\left(19+9v\right)$
$4\:\left(3\:+\:5\right)\:-\:3\cdot9^2$
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