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c in (-oo:+oo)
5 = (-1/2)*c // - (-1/2)*c
5-((-1/2)*c) = 0
(1/2)*c+5 = 0
1/2*c+5 = 0 // - 5
1/2*c = -5 // : 1/2
c = -5/1/2
c = -10
c = -10
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