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c in (-oo:+oo)
(2/3)*(c-28) = 7 // - 7
(2/3)*(c-28)-7 = 0
2/3*(c-28)-7 = 0
2/3*(c-28)-7 = 0
2/3*c-77/3 = 0
2/3*c-77/3 = 0
2/3*c-77/3 = 0 // + 77/3
2/3*c = 77/3 // : 2/3
c = 77/3/2/3
c = 77/2
c = 77/2
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