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c in (-oo:+oo)
(2/3)*(c-6) = 6 // - 6
(2/3)*(c-6)-6 = 0
2/3*(c-6)-6 = 0
2/3*(c-6)-6 = 0
2/3*c-10 = 0
2/3*c-10 = 0
2/3*c-10 = 0 // + 10
2/3*c = 10 // : 2/3
c = 10/2/3
c = 15
c = 15
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