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c in (-oo:+oo)
(2*c)/7 = 4/35 // - 4/35
(2*c)/7-(4/35) = 0
(2*c)/7-4/35 = 0
2/7*c-4/35 = 0 // + 4/35
2/7*c = 4/35 // : 2/7
c = 4/35/2/7
c = 2/5
c = 2/5
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