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