The preceding process using this equation yields: − − h ν ν k T e h ν ν / k T e h ν ν / k T − − 1 + 3 = 0. The net result is: x = 3 ( 1 − − e − − x ) . This is similarly solved with the Lambert W function: x = 3 + W 0 ( − − 3 e − − 3 ) giving x = 2.821 439 372 122 078 893....