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x in (-oo:+oo)
(3/5)*x = 9/25 // - 9/25
(3/5)*x-(9/25) = 0
(3/5)*x-9/25 = 0
3/5*x-9/25 = 0 // + 9/25
3/5*x = 9/25 // : 3/5
x = 9/25/3/5
x = 3/5
x = 3/5
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