7*(x-1)=2x+314x-7=2x+314x-2x=7+312x=10x=10/12x=5/6
7*(x-1)=2x+37x-7=2x+37x-2x=7+35x=10x=2
7﹙x-1﹚=2x+37x-7=2x+37x-2x=3+75x=10x=2
7x-7=2x+37x-2x=3+75x=10x=2