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c in (-oo:+oo)
3/5 = (9/10)*c // - (9/10)*c
3/5-((9/10)*c) = 0
(-9/10)*c+3/5 = 0
3/5-9/10*c = 0 // - 3/5
-9/10*c = -3/5 // : -9/10
c = -3/5/(-9/10)
c = 2/3
c = 2/3
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