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C in (-oo:+oo)
4*C-(1/2) = 31/2 // - 31/2
4*C-(1/2)-(31/2) = 0
4*C-1/2-31/2 = 0
4*C-16 = 0 // + 16
4*C = 16 // : 4
C = 16/4
C = 4
C = 4
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