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c in (-oo:+oo)
(3/4)*c = 45/4 // - 45/4
(3/4)*c-(45/4) = 0
(3/4)*c-45/4 = 0
3/4*c-45/4 = 0 // + 45/4
3/4*c = 45/4 // : 3/4
c = 45/4/3/4
c = 15
c = 15
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