(2x+5y) (4x-8z) (15z-6y) (z-2x)
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=(2x+5y) (4x-8z) (15z-6y) (z-2x)
=(8x²-16xz+20xy-40yz) (15z²-30xz-6yz+12xy)
=120x²y²-240x³z-48x²ya+96x³y -24xz³+48x²y²+ 96xyz² -192x²yz
+300xyz²-600x²yz -120xy²z+240 x²y²
-600yz³+1200xyz²+240y²z²-480xy²z
=168x²z²-240x³z-840x²yz+96x³y -24xz³+1596xyz²-600xy²z+240x²y² -600yz³+240y²z²
Correct me if wrong.
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