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c in (-oo:+oo)
c/1.2-6.5 = 7 // - 7
c/1.2-7-6.5 = 0
0.83333333*c-13.5 = 0 // + 13.5
0.83333333*c = 13.5 // : 0.83333333
c = 13.5/0.83333333
c = 16.20000006
c = 16.20000006
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