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c in (-oo:+oo)
(3/4)*c = 11.25 // - 11.25
(3/4)*c-11.25 = 0
3/4*c-11.25 = 0 // + 11.25
3/4*c = 11.25 // : 3/4
c = 11.25/3/4
c = 15
c = 15
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