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C in (-oo:+oo)
C/28 = 49/16 // - 49/16
C/28-(49/16) = 0
C/28-49/16 = 0
1/28*C-49/16 = 0 // + 49/16
1/28*C = 49/16 // : 1/28
C = 49/16/1/28
C = 343/4
C = 343/4
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