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c in (-oo:+oo)
12 = (2*c)/3-18 // - (2*c)/3-18
12-((2*c)/3)+18 = 0
(-2/3)*c+12+18 = 0
30-2/3*c = 0 // - 30
-2/3*c = -30 // : -2/3
c = -30/(-2/3)
c = 45
c = 45
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