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423^12 - 24^15 = x ( mod 10 )
• 423 = 3 ( mod 10 ) dan 24 = 4 ( mod 10 )
3^12 - 4^15 = x ( mod 10 )
1 - 4 = x ( mod 10 )
-3 = x ( mod 10 )
= 7 ( mod 10 )
maka nilai satuannya adalah 7