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c in (-oo:+oo)
c/(-8.8) = -1.56 // + 1.56
c/(-8.8)+1.56 = 0
1.56-0.11363636*c = 0 // - 1.56
-0.11363636*c = -1.56 // : -0.11363636
c = -1.56/(-0.11363636)
c = 13.72800044
c = 13.72800044
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