Let Delta(y)=|{:(y+a,y+b,y+a-c),(y+b,y+c...

Let `Delta(y)=|{:(y+a,y+b,y+a-c),(y+b,y+c,y-1),(y+c,y+d,y-b+d):}|`
and, `int_(0)^(2) Delta(y)dy=-16`, where a,b,c,d are in A.P., then the common difference of the A.P. is equal to

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