×-4 y3 z3 ________ ×6 y-4 z-5

x^(-4) y^3 z^3
-----------------------
x^6 y^(-4) z^(-5)
x^(-4-6) y^(3-(-4)) z^(3-(-5))
x^(-10) y^7 z^8
1
------ y^7 z^8
x^10
y^7 z^8
-----------
x^10

^ (pangkat)