No it does not make sense. You misused the parenthesis and the "-" multiplied the variables within the parenthesis and as a result one of them subtracted (15 - 6) by 3 and the other added, which is why the final values are 6 apart. This is not how you use properties in math. (15 - 6) - 3 = 9 - 3 = 6 15 - (6 - 3) = 15 - 3 = 12
