Best not to mix "E" with "e." Also, please note that "e" is a special number in Math, often used as the base of exponential functions, valued at approx. 2.718.
12e-6*3e could be factored: 12e - 6*3e = 6e(2 - 3) = -6e
If e=0.6, then -6e = -6(0.6) = -3.6
Double-check to ensure that you have copied down this problem exactly as the original appears.
\