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