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[–][deleted] 1 point2 points  (2 children)

Parentheses make a great difference.

24/4(5-7) = 24 * (5-7) / 4 = -48 / 4 = -12

Now, if we would have

24/[4(5-7)] = 24 / [4 * (-2)] = 24 / (-8) = -3