simplify: 2/3 + -4/5 + 7/15 + -11/20


simplify: 2/3 + -4/5 + 7/15 + -11/20

2/3 + -4/5 + 7/15 + -11/20

=2/3 - 4/5 + 7/15 - 11/20

=(40-48+28-22)/60

=-2/60

=-1/30    

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