((m(m + 1)) \div 2) { }^{2} + (m + 1) ^{3}
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m - (m - 1)/2 = 1- (m - 2)/3
(2m - m + 1)/2 = (3 - m + 2)/3
(m + 1)/2 = ( 5 - m)/3
3(m + 1) = 2(5 - m)
3m + 3 = 10 - 2m
3m + 2m = 10 - 3
5m = 7
m = 7/5
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