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