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