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c in (-oo:+oo)
25/4 = (3/5)*c // - (3/5)*c
25/4-((3/5)*c) = 0
(-3/5)*c+25/4 = 0
25/4-3/5*c = 0 // - 25/4
-3/5*c = -25/4 // : -3/5
c = -25/4/(-3/5)
c = 125/12
c = 125/12
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