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= 8xkubik + 4xkuadraty + 2xykuadrat - 4xkuadraty - 2xykuadrat - ykubik
= 8xkubik + 4xkuadraty - 4xkuadraty + 2xykuadrat - 2xykuadrat - ykubik
= 8xkubik - ykubik
Kalau menurutku sihh gitu..