Respuesta :
					                   you need to isolate e on one side of the formula
you can do this by adding -2 to both sides:-
f + v -2 = e +2 - 2
f + v - 2 = e
thats it
e = f + v - 2
					                
					             you can do this by adding -2 to both sides:-
f + v -2 = e +2 - 2
f + v - 2 = e
thats it
e = f + v - 2
 
			                  