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x in (-oo:+oo)
(3/5)*x = 6/15 // - 6/15
(3/5)*x-(6/15) = 0
(3/5)*x-2/5 = 0
3/5*x-2/5 = 0 // + 2/5
3/5*x = 2/5 // : 3/5
x = 2/5/3/5
x = 2/3
x = 2/3
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