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4 - (-5) = 4 + 5 = 9.
5 + 4*(3-2) = 9(5 - 4)*3^2 = 9 - 5 + 4 * 3 + 2 = 9
-4
(4/9) * (5/9) = 20/81
9 and 4 9-4 = 5 9*4 = 36