using suitable arragement find the sum [-6/7]+[-5/6]+[-4/9]+[-15/7]
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(-6/7)+(-15/7)+(-4/9)+(-5/6)
={(-6-15)/7+(-8-15)/18}
={(-21)/7+(-23)/18}
={-3+(-23)/18}
=(-54-23)/18
=-77/18
={(-6-15)/7+(-8-15)/18}
={(-21)/7+(-23)/18}
={-3+(-23)/18}
=(-54-23)/18
=-77/18
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