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c in (-oo:+oo)
(2/3)*c-18 = 7 // - 7
(2/3)*c-18-7 = 0
2/3*c-25 = 0 // + 25
2/3*c = 25 // : 2/3
c = 25/2/3
c = 75/2
c = 75/2
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