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x in (-oo:+oo)
(2/3)*x = 9/10 // - 9/10
(2/3)*x-(9/10) = 0
(2/3)*x-9/10 = 0
2/3*x-9/10 = 0 // + 9/10
2/3*x = 9/10 // : 2/3
x = 9/10/2/3
x = 27/20
x = 27/20
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