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c in (-oo:+oo)
c/9 = 6.1 // - 6.1
c/9-6.1 = 0
1/9*c-6.1 = 0 // + 6.1
1/9*c = 6.1 // : 1/9
c = 6.1/1/9
c = 54.90000055
c = 54.90000055
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