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9x -6 = 12
9x = 18
x = 2
AB = 2x = 2 x 2 = 4
AC = 3x - 2 = 3x2 - 2 = 4
BC = 4x - 4 = 4x2 - 4 = 4
9x + (-6) = 12
9x = 18
x = 2cm
AB = 2× = 4 cm
AC = 3× - 2 = 4cm
BC = 4× -4 = 4cm