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Anonymous
2n-5 = 8n+7
Subtract 8n from both sides and add 5 to both sides:-
-6n = 12
Divide both sides by -6 to find the value of n:-
n = -2
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18 t(n) = (2n5 - 35n4 + 230n3 - 715n2 + 1178n - 600)/60 for n = 1, 2, 3, ...