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E = -2b+5a+{a-2[a+3b-4a-4b]-12a}
E = -2b+5a+{a-2a-6b+8a+8b-12a}
E = -2b+5a+{-5a+2b}
E = -2b+5a-5a+2b
E = 0
Respuesta A