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c in (-oo:+oo)
7/3-((2/3)*c) = 0
(-2/3)*c+7/3 = 0
7/3-2/3*c = 0 // - 7/3
-2/3*c = -7/3 // : -2/3
c = -7/3/(-2/3)
c = 7/2
c = 7/2
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