27x+38c+42c-8x=27x-8x+38c+42c=21*5+60*7=105+420=425
27*5+38*7+42*7-8*5=(27-8)*5+(38+42)*7=19*5+60*7=95+420=515
27x+38c+42c-8x=27x-8x+38c+42c=21*5+60*7=105+420=425
27*5+38*7+42*7-8*5=(27-8)*5+(38+42)*7=19*5+60*7=95+420=515