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