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2014-10-28T15:09:10+01:00
9(x - 1)² - 4 = 0
9(x - 1)² = 4
(x - 1)² = 4/9
√(x - 1)² = √4/9
x - 1 = √4/√9
x - 1 = 2/3
x = 2/3 + 1

x = 5/3