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80=2.(2x-3+x+7)
80=2.(3x+4)
80=6x+8
6x=80-8
6x=72
x=72
6
x=12 cm
80 = 2 ((2x - 3) + ( x + 7))
80 = 2 (2x - 3 + x + 7)
80 = 2 (3x + 4)
80 = 6x + 8
6x = 80 - 8
6x = 72
x = 12 cm