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c in (-oo:+oo)
-(c/4)-3 = 12-((3*c)/4) // - 12-((3*c)/4)
(3*c)/4-(c/4)-12-3 = 0
1/2*c-15 = 0 // + 15
1/2*c = 15 // : 1/2
c = 15/1/2
c = 30
c = 30
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