mx+2=3x+4 mx-3x=2 x(m-3)=2 x=2/(m-3) m-3=-2 m-3=-1 m-3=1 m-3=2 m=1 m=2 m=4 m=5 mx-1=2(x+6) mx-1=2x+12 mx-2x=13 x(m-2)=13 x=13/(m-2) m-2=-13 m-2=-1 m-2=1 m-2=13 m=-11 m=1 m=3 m=15