When are these equations true? (example equation) 6x+3=15: this is only true when x=15 can someone help me understand the following equations for my homework? thanks :D 12-x=15 x-3=3-x x/2=6 10/x=20 3(x+4)=3x+4 2(x+3)=2x+6 (please do what the example question was and not just solving them!)â