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c in (-oo:+oo)
2/4 = 7*c // - 7*c
2/4-(7*c) = 0
2/4-7*c = 0
1/2-7*c = 0 // - 1/2
-7*c = -1/2 // : -7
c = -1/2/(-7)
c = 1/14
c = 1/14
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