-5 + 9 = 4
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5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 9 + 9 + 9 + 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 = 43
9*5=45 or 5+5+5+5+5+5+5+5+5=45 or1*5*9=45
-9
5x + 4 - 3x + 5 + 2x - 9 = 4x
5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 45, the shorter version is 5*9.