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c in (-oo:+oo)
c/2.2 = 7.2 // - 7.2
c/2.2-7.2 = 0
0.45454545*c-7.2 = 0 // + 7.2
0.45454545*c = 7.2 // : 0.45454545
c = 7.2/0.45454545
c = 15.84000016
c = 15.84000016
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