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Summation: How to Solve

How to solve the given summation by using the summation properties: 3 examples and their solutions.

Example∑ ak = 7, ∑ bk = -3, ∑ (5ak + 2bk) = ?

Example∑ ak = 5, ∑ (2ak - 7) = ?

Example∑ ak = n2 + 1, ∑ nak = ?