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1 + ln ( x ) ln ( x ) x x − e x − 1 = x = x − 1 = e x − 1 = 0 Exponentiate Let f ( x ) = x − e x − 1 . Then f ′ ( x ) = 1 − e x − 1 . Solving f ′ ( x ) = 0 yields x = 1 as the only critical point. Evaluating f ′ ′ ( 1 ) = − e 0 = − 1 tells us that f ( 1 ) = 0 is the maximum value of f ( x ) . Thus (since f ( x ) is everywhere differentiable) x = 1 it is the only root of f ( x ) and, therefore, the only solution to our original equation.