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c in (-oo:+oo)
-4/9 = (2/3)*c // - (2/3)*c
-((2/3)*c)-4/9 = 0
(-2/3)*c-4/9 = 0
-2/3*c-4/9 = 0 // + 4/9
-2/3*c = 4/9 // : -2/3
c = 4/9/(-2/3)
c = -2/3
c = -2/3
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