lf 0 < x, y <= 1000 where, x, y in N suc...

lf `0 < x, y <= 1000` where, `x, y in N` such that `[x/2]+[(2x)/3]+[y/4]+[(4y)/5]=(7x)/6+(21y)/20` (where ,[] denotes the greatest integer function) then number of ordered pair (x, y) is

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