=(-4/3x^-4*y^-3)^3 * (-9/8 x^6*y^7)^2=
-4^3/3^3 x^-12*y^-9*(-9^2 x^12*y^14)/8^2=
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=(-4/3x^-4*y^-3)^3 * (-9/8 x^6*y^7)^2=
-4^3/3^3 x^-12*y^-9*(-9^2 x^12*y^14)/8^2=
-64/27*x^-12*y^-9*(81x^12*y^14)/64=-3y^5