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c in (-oo:+oo)
90*c-5 = 1/7 // - 1/7
90*c-(1/7)-5 = 0
90*c-1/7-5 = 0
90*c-36/7 = 0 // + 36/7
90*c = 36/7 // : 90
c = 36/7/90
c = 2/35
c = 2/35
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