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c in (-oo:+oo)
9.1/0.3 = c/4.3 // - c/4.3
9.1/0.3-(c/4.3) = 0
9.1/0.3-0.23255814*c = 0
30.33333333-0.23255814*c = 0 // - 30.33333333
-0.23255814*c = -30.33333333 // : -0.23255814
c = -30.33333333/(-0.23255814)
c = 130.43333306
c = 130.43333306
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