Evaluating expressions with the order of operations

What is the value of 17 - 3[(-1 + 2(7 - 4)] ?

17 - 3[-1 + 2(7 - 4)] 
=  17 - 3[-1 + 2(3)]   {worked inside parentheses within brackets}
=  17 - 3[-1 + 6]   {multiplied inside brackets}
=  17 - 3(5)   {added inside brackets}
=  17 - 15   {multiplied}
=  2   {subtracted}

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