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The sum is: 72+9 = 81
-9 would be the same as -|9|.
8/9 = 0.888888(repeating)
Fractions that are not equivalent to 36/72 are 1/4, 3,8, 37/72, 7/9 and many, many others.
y2-y-72 is an algebraic expression that can be factored as: (y+8)(y-9)