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3n² −n=102
3n² −n - 102 = 0
3n......... +17
n..............-6
-18n + 17n = -n
(3n +17)(n-6)
3n+17 =0
3n = -17
n =-17/3
n -6 =0
n = 6
CS= (-17/3; 6)