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c in (-oo:+oo)
c/7-3 = 2*c+3/14 // - 2*c+3/14
c/7-(2*c)-(3/14)-3 = 0
c/7-2*c-3/14-3 = 0
-13/7*c-45/14 = 0 // + 45/14
-13/7*c = 45/14 // : -13/7
c = 45/14/(-13/7)
c = -45/26
c = -45/26
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