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c in (-oo:+oo)
(2/3)*c-4 = 5 // - 5
(2/3)*c-5-4 = 0
2/3*c-9 = 0 // + 9
2/3*c = 9 // : 2/3
c = 9/2/3
c = 27/2
c = 27/2
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