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9c+(-13b)
9c-13b
4c + 4b +5c - 8b - 9b=
(4c + 5c) +( 4b -8b - 9b) =
9c +( 4b -17b)
9c +( -13b) = Aplicamos ley de signos en rl parentesis + Por - = -
9c - 13b
Solucion de la simplificacion:
9c - 13b.