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x in (-oo:+oo)
(2/5)*x = 8/35 // - 8/35
(2/5)*x-(8/35) = 0
(2/5)*x-8/35 = 0
2/5*x-8/35 = 0 // + 8/35
2/5*x = 8/35 // : 2/5
x = 8/35/2/5
x = 4/7
x = 4/7
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