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c in (-oo:+oo)
6*(2/5) = (4/5)*c // - (4/5)*c
6*(2/5)-((4/5)*c) = 0
(-4/5)*c+6*(2/5) = 0
12/5-4/5*c = 0 // - 12/5
-4/5*c = -12/5 // : -4/5
c = -12/5/(-4/5)
c = 3
c = 3
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