One line of the pair of lines x^2+x y-2 y^2=0 is perpendicular to one line of the pair of lines 3 y^2-5 x y-2 x^2=0 . If the combined equation of the two lines other than those two perpendicular lines is a x^2+2 h x y+b y^2=0 , then a+2 h+b=