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c in (-oo:+oo)
(2/3)*(c-18)-7 = 0
2/3*(c-18)-7 = 0
2/3*(c-18)-7 = 0
2/3*c-19 = 0
2/3*c-19 = 0
2/3*c-19 = 0 // + 19
2/3*c = 19 // : 2/3
c = 19/2/3
c = 57/2
c = 57/2
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