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