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If a,b,a,b,a,b, and ccc are the side lengths of △ABC\triangle ABC△ABC opposite to angles A,B,A,B,A,B, and C,C,C, respectively, and r1,r2,r_{1},r_{2},r1,r2, and r3r_{3}r3 are the corresponding exradii, then find the value of
b−cr1+c−ar2+a−br3.\frac {b-c}{r_{1}} + \frac {c-a}{r_{2}} + \frac{a-b}{r_{3}}.r1b−c+r2c−a+r3a−b.
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