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x in (-oo:+oo)
(2/5)*x = 9/11 // - 9/11
(2/5)*x-(9/11) = 0
(2/5)*x-9/11 = 0
2/5*x-9/11 = 0 // + 9/11
2/5*x = 9/11 // : 2/5
x = 9/11/2/5
x = 45/22
x = 45/22
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