640 : ( 12к + 4) = 16
12к + 4 = 640 : 16
12к + 4 = 40
12к = 40 - 4
12к = 36
к = 36 : 12
к = 3
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640 : ( 12к + 4) = 16
12к + 4 = 640 : 16
12к + 4 = 40
12к = 40 - 4
12к = 36
к = 36 : 12
к = 3