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5[7x-2a+b)-12x-6b]8
5[-5x-2a-5b]8
5[-2a+6x+b+12x+2b]-8
5-2a+6x+b+12x+2b-8
Sumamos y restamos lo semejante
-3-2a+18x+3b
Espero y te sirva saludos