Johannes Rau (born January 16, 1931) has been the President of Germany since July 1, 1999.
He was born in Wuppertal-Barmen.
See also: Germany, Germany/Politics.
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... roots of both sides yields <math>x+\frac{b}{2a}=\frac{\pm\sqrt{b^2-4ac}}{2a}.</math> Subtracting b/(2a) from both sides, w ...