lanieudemontay91 lanieudemontay91 03-03-2021 Mathematics contestada + 6x + 7 + 6x + 9 = (6x + 7) + (6x + 9) = 6x + (7 + 6x) +9 = 6x + (6x + 7) + 9 = (6x + 6x) + (7 + 9) = (6 + 6)X + (7 + 9) = 12x + 16