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c in (-oo:+oo)
13 = (1/2)*c // - (1/2)*c
13-((1/2)*c) = 0
(-1/2)*c+13 = 0
13-1/2*c = 0 // - 13
-1/2*c = -13 // : -1/2
c = -13/(-1/2)
c = 26
c = 26
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