Respuesta :
					                   Distribute the negative sign. 
Remember a negative times a negative results in a positive.
f+4=12
Subtract the four from both sides to get the variable alone.
f=12-4
f=8
					                
					             Remember a negative times a negative results in a positive.
f+4=12
Subtract the four from both sides to get the variable alone.
f=12-4
f=8
 
			                  