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(gof)(x) = 2x² + 4x + 5
f(x) = ...?
g(f(x)) = 2x² + 4x + 5
2f(x) + 3 = 2x² + 4x + 5
2f(x) = 2x² + 4x + 2
f(x) = x² + 2x + 1