2(x-1)+5x>x+12 2x-2+5x>x+12 7x-x>12+2 6x>14 /:6 x>2i1/3 x∈(2i1/3,+∞)
2x-2+5x>x+12 2x-x+5x>12+2 6x>14 /:6 x>2⅓