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x in (-oo:+oo)
-45 = 5*x-((1/3)*x) // - 5*x-((1/3)*x)
(1/3)*x-(5*x)-45 = 0
(1/3)*x-5*x-45 = 0
-14/3*x-45 = 0 // + 45
-14/3*x = 45 // : -14/3
x = 45/(-14/3)
x = -135/14
x = -135/14
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