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x in (-oo:+oo)
(3/5)*x = 12/35 // - 12/35
(3/5)*x-(12/35) = 0
(3/5)*x-12/35 = 0
3/5*x-12/35 = 0 // + 12/35
3/5*x = 12/35 // : 3/5
x = 12/35/3/5
x = 4/7
x = 4/7
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