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c in (-oo:+oo)
(3/2)*c+4 = 15 // - 15
(3/2)*c-15+4 = 0
3/2*c-11 = 0 // + 11
3/2*c = 11 // : 3/2
c = 11/3/2
c = 22/3
c = 22/3
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