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c in (-oo:+oo)
(5*c-1)/3 = 7 // - 7
(5*c-1)/3-7 = 0
(5*c-1)/3+(-7*3)/3 = 0
5*c-7*3-1 = 0
5*c-22 = 0
(5*c-22)/3 = 0
(5*c-22)/3 = 0 // * 3
5*c-22 = 0
5*c-22 = 0 // + 22
5*c = 22 // : 5
c = 22/5
c = 22/5
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