book Maths Puzzle Numerical Ability

can u show me the steps for this problem 24-[10-(3-7)]+(5-7)3

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Hi, Goog morning, I am having a math test on Monday and I need a little help recognizing functions and non functions . Do you think you can help me understand? I am an A student and would like to get as much help as I can when a postive is multiplied by a negative is the solution a postive or a negative? i think it is postive but im not sure...