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There is no equation or inequality in the question and so nothing that can be solved.
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5n+15 = 25 5n = 25-15 5n = 10 n = 2
n2 = 20 + n so n2 - n - 20 = 0 that is (n - 5)(n + 4) = 0 so that n - 5 = 0 or n + 4 = 0 n = 5 or n = -4
5n + 15 = 25 you subtract 15 from both sides then you get 10 then divided 5n by 10 you get 2n
It is impossible to solve for n if there's nothing to equate it with. No could be any number each except for -4. All we know is n = n
what is the value of "N"? we can solve this equation when we know the value of N, once we know the value of N we just add 1 to it,