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x in (-oo:+oo)
(2/3)*x-1 = 1/6 // - 1/6
(2/3)*x-(1/6)-1 = 0
(2/3)*x-1/6-1 = 0
2/3*x-7/6 = 0 // + 7/6
2/3*x = 7/6 // : 2/3
x = 7/6/2/3
x = 7/4
x = 7/4
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