i didnt get the circled step. how multuplucation became subtraction plss explain

Dear Student,
This method is known as 'partial fraction denominator rules' . If you solve 1313n-1-13n+2  by taking L.C.Myou will get =133n+2-3n+13n-13n+2                     =13×33n-13n+2                     =13n-13n+2
Regards

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