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x in (-oo:+oo)
(2/3)*x = 9/12 // - 9/12
(2/3)*x-(9/12) = 0
(2/3)*x-3/4 = 0
2/3*x-3/4 = 0 // + 3/4
2/3*x = 3/4 // : 2/3
x = 3/4/2/3
x = 9/8
x = 9/8
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