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C in (-oo:+oo)
C/3+4 = C/6+5 // - C/6+5
C/3-(C/6)-5+4 = 0
1/6*C-1 = 0 // + 1
1/6*C = 1 // : 1/6
C = 1/1/6
C = 6
C = 6
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