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C in (-oo:+oo)
C/4-((2*C)/3) = 5 // - 5
C/4-((2*C)/3)-5 = 0
C/4+(-2/3)*C-5 = 0
-5/12*C-5 = 0 // + 5
-5/12*C = 5 // : -5/12
C = 5/(-5/12)
C = -12
C = -12
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