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c in (-oo:+oo)
c/5 = 6/20 // - 6/20
c/5-(6/20) = 0
c/5-3/10 = 0
1/5*c-3/10 = 0 // + 3/10
1/5*c = 3/10 // : 1/5
c = 3/10/1/5
c = 3/2
c = 3/2
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