Hey!
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Steps To Solve:
5n + 5 = 20
~Subtract 5 to both sides
5n + 5 - 5 = 20 - 5
~Simplify
5n = 15
~Divide 5 to both sides
5n/5 = 15/5
~Simplify
n = 3
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Hence, the answer is

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Hope This Helped! Good Luck!