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If $(2x + 3y + 4)(2x + 3y - 5)$ is equivalent to $(ax^2 + by^2 + 2hxy + 2gx + 2fy + c)$, then what is the value of $\left\{\frac{g + f - c}{abh}\right\}$? |
$\frac{37}{216}$ $\frac{19}{216}$ $\frac{19}{108}$ $\frac{35}{432}$ |
$\frac{35}{432}$ |
