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81 = 9 x2x+3
9 = 2x+ 3
6 = 2x
x = 3
81 = 18 x (2x+3) / 2
81.2 = 18 x (2x + 3)
162 = 18 x (2x + 3)
162 = 54 x 36x
162 : 54 = 36x
3 = 36x
x = 36/3
x = 12