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c in (-oo:+oo)
2/14 = -c/7 // + -c/7
2/14-(-c/7) = 0
(1/7)*c+2/14 = 0
1/7*c+1/7 = 0 // - 1/7
1/7*c = -1/7 // : 1/7
c = -1/7/1/7
c = -1
c = -1
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