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11−56+712−920+1130−1342+1556−1772+1990 \dfrac{1}{1} - \dfrac{5}{6} + \dfrac{7}{12} - \dfrac{9}{20} + \dfrac{11}{30} - \dfrac{13}{42} + \dfrac{15}{56} - \dfrac{17}{72} + \dfrac{19}{90} 11−65+127−209+3011−4213+5615−7217+9019
If the expression above is in the form of ab \frac a b ba for coprime positive integers a,ba,ba,b, find a+ba+ba+b?
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