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c in (-oo:+oo)
(2/3)*(c-18) = 18 // - 18
(2/3)*(c-18)-18 = 0
2/3*(c-18)-18 = 0
2/3*(c-18)-18 = 0
2/3*c-30 = 0
2/3*c-30 = 0
2/3*c-30 = 0 // + 30
2/3*c = 30 // : 2/3
c = 30/2/3
c = 45
c = 45
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