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c in (-oo:+oo)
-1 = (5/4)*c-2 // - (5/4)*c-2
2-((5/4)*c)-1 = 0
(-5/4)*c-1+2 = 0
1-5/4*c = 0 // - 1
-5/4*c = -1 // : -5/4
c = -1/(-5/4)
c = 4/5
c = 4/5
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