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x in (-oo:+oo)
(1/3)*x = (8/15)*x-(2/5) // - (8/15)*x-(2/5)
(1/3)*x-((8/15)*x)+2/5 = 0
(1/3)*x+(-8/15)*x+2/5 = 0
2/5-1/5*x = 0 // - 2/5
-1/5*x = -2/5 // : -1/5
x = -2/5/(-1/5)
x = 2
x = 2
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