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c in (-oo:+oo)
(2/3)*(9*c+12) = 26 // - 26
(2/3)*(9*c+12)-26 = 0
2/3*(9*c+12)-26 = 0
2/3*(9*c+12)-26 = 0
6*c-18 = 0
6*c-18 = 0
6*c-18 = 0 // + 18
6*c = 18 // : 6
c = 18/6
c = 3
c = 3
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