if a simple algebraic equation you isolate e by subtracting 12.2 from both sides. e = 27.8

if an exponential equation with an exponent variable such as

e^x + 12.2 = 40

then subtract 12.2 from btoh sides to place in BEN form Base Exponent Number

e^x = 27.8

then take the ln of both sides

ln[e^x] = ln[27.8]

x = ln[27.8] (a calculator problem)