64 + 16 + 8 + 12 = ( 64 + 16 ) + ( 8 + 12 ) = 80 + 20 = 100
52 - ( 30 + 12 ) = ( 52 - 12 ) - 30 = 40 - 30 = 10
100 - ( 25 + 25 ) = 100 - 50 = 50
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64 + 16 + 8 + 12 = ( 64 + 16 ) + ( 8 + 12 ) = 80 + 20 = 100
52 - ( 30 + 12 ) = ( 52 - 12 ) - 30 = 40 - 30 = 10
100 - ( 25 + 25 ) = 100 - 50 = 50