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-10x 1/x^3 (x+3)=
-10*1/x^3 (x+3)=
10-/x^3(x+3)=
(10-/x^3x*10-/x^3*3)=
(10-/x^2-30/x^3)=
x*-10-1*30/x^3=
x*-10-30/x^3=
-10x-30/x^3
___________________
Respuesta:-10x-30/x^3
Saludos;