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