solve 10.785*v1+0.074*v2+0.125*v3+0.55*v4+0.35*v5 =100, v1+v2+v3+v4+v5=200, v1>0, v2>0, v3>0, v4>0, v5>0 for v1,v2,v3,v4,v5

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