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c in (-oo:+oo)
6 = -((5/4)*c)-9 // + -((5/4)*c)-9
(5/4)*c+6+9 = 0
5/4*c+15 = 0 // - 15
5/4*c = -15 // : 5/4
c = -15/5/4
c = -12
c = -12
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