Question

-9e+3.1+5e-7.1=8 what does e equal

Answer 1

first combine like terms, get all the numbers to one side and all the variables to one side.
-9e + 5e = -4e
3.1 - 7.1 = -4 so you have -4e - 4.1 = 8
add 4.1 to each side
-4e = 12.1
divide both sides by -4
e = -12.1/4

Answer 2

k thanks