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x in (-oo:+oo)
(2/5)*x = 8/15 // - 8/15
(2/5)*x-(8/15) = 0
(2/5)*x-8/15 = 0
2/5*x-8/15 = 0 // + 8/15
2/5*x = 8/15 // : 2/5
x = 8/15/2/5
x = 4/3
x = 4/3
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