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