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x in (-oo:+oo)
(1/5)*x = 4/15 // - 4/15
(1/5)*x-(4/15) = 0
(1/5)*x-4/15 = 0
1/5*x-4/15 = 0 // + 4/15
1/5*x = 4/15 // : 1/5
x = 4/15/1/5
x = 4/3
x = 4/3
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