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c in (-oo:+oo)
(c-3)/6 = 7/3 // - 7/3
(c-3)/6-(7/3) = 0
(c-3)/6-7/3 = 0
(3*(c-3))/(3*6)+(-7*6)/(3*6) = 0
3*(c-3)-7*6 = 0
3*c-51 = 0
(3*c-51)/(3*6) = 0
(3*c-51)/(3*6) = 0 // * 3*6
3*c-51 = 0
3*c-51 = 0 // + 51
3*c = 51 // : 3
c = 51/3
c = 17
c = 17
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