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Substitute n(x) = 17 in ; n(x) = 2x + 7 and then solve for x
That is;
n(x) = 2x + 7
17 = 2x + 7
subtract 7 from both-side of the equation
17 - 7 = 2x
10 = 2x
divide both-side of the equation by 2
10/2 = 2x/2
x = 5