August 2018 1 33 Report
Establezca si cada una de las siguientes igualdades es valida o no. Reemplace cada proposicion falsa por una que sea correcta.

a) 3x + 4x = 7x

b) -(x + y) = -x + y

c) 5 - 2x = 3x

d) a - (b - c) = (a + c) - b


e) (-x)(-y) = -xy

Ayuda por favor!!
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