Respuesta :
					                   15x = 3x + 120 (subtract both sides by 3x)
12x = 120 (divide both sides by 12)
x = 100
					                
					                
					             12x = 120 (divide both sides by 12)
x = 100
					                   X=10 thats the answer just go to mathway . com and put your problem in to get your answer
					                
					                
					              
			                   
					                  