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c in (-oo:+oo)
1.4 = c/1.4 // - c/1.4
1.4-(c/1.4) = 0
1.4-0.71428571*c = 0
1.4-0.71428571*c = 0 // - 1.4
-0.71428571*c = -1.4 // : -0.71428571
c = -1.4/(-0.71428571)
c = 1.96000001
c = 1.96000001
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