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[x⁴y³*y⁵]÷x⁷
x⁻³y³*y⁵/x⁷
(-1)⁻³*(-3)³*(-3)⁵/(-1)⁷
(-1)*(-27)*(-243)/(-1)
27*243=6561
x ⁴ ÷ x ⁷ * y ² * y ³
x ⁻ ³ * y ⁵
( - 1 ) ⁻ ³ * ( - 3 ) ⁵
= - 243