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put this solution on YOUR website! We can first simplify this question by combining the two negative signs together (negative and negative = positive). Then we find the common denominators by multiplying the two denominators together.
-1/8 - (-5/9) = -1/8 + 5/9 = (-1*9)/72 + (5*8)/72 = -9/72 + 40/72 = 31/72
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