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