verify the following (3/4+-1/3)+-5/7=3/4+(-1/3+-5/7)
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(-3/4+(-1/3))+(-5/7) = 3/4+(-1/3+(-5/7))
=>(-3/4-1/3)-5/7 = 3/4+(-1/3-5/7)
=>(-9-4/12)-5/7 = 3/4+(-7-15/21)
=>-13/12-5/7 = 3/4+(-22/21)
=>-91-60/84 = 3/4-22/21
=>-151/84 = 61-88/84
=>151/84 = -27/84
=>151/84 ≠ -27/84
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