October 2018 1 121 Report
Necesito si me pueden resolver estos 3 ejercicios PASO POR PASO por favor, es que mi cabeza dura no lo entiende si no es paso a paso :c gracias :)

a) - { - [ - ( -7x - 2y ) ] } + { - ( 2y+ 7x ) ] }


b) 3a + ( a + 7b - 4c ) - ( 3a + 5b - 3c ) - ( b - c )


c) - ( x - 2y ) - [ { 3x - ( 2y - z ) } - { 4x - ( 3y - 2z } ]
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