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c in (-oo:+oo)
15 = (2/3)*c // - (2/3)*c
15-((2/3)*c) = 0
(-2/3)*c+15 = 0
15-2/3*c = 0 // - 15
-2/3*c = -15 // : -2/3
c = -15/(-2/3)
c = 45/2
c = 45/2
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