find = 3/7 + (-5/11) + (-9/21) + (5/22)
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3/7 + (-5/11) + (-9/21) + (5/22)
.......(LCM = 3234)
(1386 - 1470 - 1386 + 735)/3234
= -735/3234 = - 0.227272727 = - 0.23
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