(x-1)/2+1≥x x-1+2≥2x-x≥-1x≤1
(2x-1)/3-(5x+1)/2≤12(2x-1)-3(5x+1)≤64x-2-15x-3≤6-11x≤11 x≥-1
3y-(3-4y)/7≤5y/2-1 42y-2(3-4y)≤35y-1442y+8y-35y≤-14+6 15y≤-8 y≤-8/15