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c in (-oo:+oo)
2*c-(4/5) = 9/10 // - 9/10
2*c-(4/5)-(9/10) = 0
2*c-4/5-9/10 = 0
2*c-17/10 = 0 // + 17/10
2*c = 17/10 // : 2
c = 17/10/2
c = 17/20
c = 17/20
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