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x in (-oo:+oo)
(c-(0.99*n))/48 = y // - y
(c-(0.99*n))/48-y = 0
(c-0.99*n)/48-y = 0
(c-0.99*n)/48+(48*(-y))/48 = 0
c-0.99*n+48*(-y) = 0
c-0.99*n-48*y = 0
(c-0.99*n-48*y)/48 = 0
(c-0.99*n-48*y)/48 = 0 // * 48
c-0.99*n-48*y = 0
x belongs to the empty set
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