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c in (-oo:+oo)
(2/3)*c = -5.9 // + 5.9
(2/3)*c+5.9 = 0
2/3*c+5.9 = 0 // - 5.9
2/3*c = -5.9 // : 2/3
c = -5.9/2/3
c = -8.84999996
c = -8.84999996
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