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x in (-oo:+oo)
(8/15)*x = 1/5 // - 1/5
(8/15)*x-(1/5) = 0
(8/15)*x-1/5 = 0
8/15*x-1/5 = 0 // + 1/5
8/15*x = 1/5 // : 8/15
x = 1/5/8/15
x = 3/8
x = 3/8
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