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c in (-oo:+oo)
4 = (-2/3)*c // - (-2/3)*c
4-((-2/3)*c) = 0
(2/3)*c+4 = 0
2/3*c+4 = 0 // - 4
2/3*c = -4 // : 2/3
c = -4/2/3
c = -6
c = -6
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