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\(\dfrac{4x^{n+3} \cdot y^{n-2}+6x^{n+2} \cdot y^{n-1}}{8x^{n+3} \cdot y^{n+1}-18x^{n+1} \cdot y^{n+3}}=\) [ \(\frac{x}{y^3 \cdot (2x-3y)}\) | \(\frac{x \cdot y^3}{ (2x-3y)}\) | \(\frac{x^n}{y^2 \cdot (2x+3y)}\) | \(\frac{x}{2y^2 \cdot (2x+3y)}\) ]