Answer:
5
Step-by-step explanation:
You need to get E by itself. Add 4 from each side
7e-4=31
+4 +4
Now we have 7e=35
we still need to get e by itself, so divide each side by 7
7e=35
/7 /7
e=5
[ Answer ]
[tex]\boxed{\bold{E \ = \ 5}}[/tex]
[ Explanation ]
-----------------------------------------
7e - 4 + 4 = 31 + 4
7e = 35
[tex]\frac{7e}{7}[/tex] = [tex]\frac{35}{7}[/tex]
E = 5
[tex]\boxed{\bold{[] \ Eclipsed \ []}}[/tex]
