efetue : a) 7x - 3x b) (3xy)-(xy)+(xy) c) (15x)-(-3x)-(+7x)+(-2y) d) (-9y)-(+3y)-(+y)+(-2y)?

e) (3a)+(-8a)+(+4a)-(-5a)-(-a) f) (-7-2a)+(1/4a) g) (-3a)-(-2a/5)

ME AJUDEM A FAZER ESSE TRABALHO POR FAVOOR , OBRIGADO :D

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