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x in (-oo:+oo)
(4/5)*x = 12/25 // - 12/25
(4/5)*x-(12/25) = 0
(4/5)*x-12/25 = 0
4/5*x-12/25 = 0 // + 12/25
4/5*x = 12/25 // : 4/5
x = 12/25/4/5
x = 3/5
x = 3/5
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