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1/2 lusin= 1/2 x 12 = 6buah
5+6-18 = (-7) buah.
kok hasilnya min ya?
1 lusin = 12 buah, jd
( 3/12 x 20 ) + ( 1/2 x 12 ) - 18 buah
5 + 6 -18
= -7