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*72+*18-*98 = *36×2 +*9×2 - *49×2= 6*2 + 3*2 -7*2 = 2*2
*20+2*5-*125 = *4×5+2*5 - *25×5 = 2*5 + 2*5 - 5*5 = -1*5
no 3 kurang tau??