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