If $a,b,c,d,e,f,g,h,j$ represents different digits from $1$ to $9$ such that $a+\frac{b}{c}+\frac{d}{e}\times f-\left(g+\frac{h}{j} \right) = N$, where $N$ is a whole number. Find the largest possible value of $N$. 
Overseas Competition->Knowledge Point->Combinatorics->Number Puzzles