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Find the roots of the characteristic equation for the differential equation:

$$2y'' + 5y' - 3y = 0$$

$r = -1/2$ and $r = -3$

$r = 1/2$ and $r = -3$

$r = -1/2$ and $r = 3$

$r = 1/2$ and $r = 3$

None of the Above