[a + 2 ] / [ a + 1] = b / 3
3[a + 2] = b[a + 1]
3a + 6 = ab + b
ab - 3a + b = 6 multiply the coefficients on a,b = (-3)(1) = -3 and add to both sides
ab - 3a + b - 3 = 6 - 3 factor the left side, simplify the right
(a + 1) (b - 3) = 3
a b
-4 2
-2 0
0 6
2 4
+1766 
