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c in (-oo:+oo)
(2*c)/3-6 = 9 // - 9
(2*c)/3-9-6 = 0
2/3*c-15 = 0 // + 15
2/3*c = 15 // : 2/3
c = 15/2/3
c = 45/2
c = 45/2
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