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c in (-oo:+oo)
11 = (-5/7)*c // - (-5/7)*c
11-((-5/7)*c) = 0
(5/7)*c+11 = 0
5/7*c+11 = 0 // - 11
5/7*c = -11 // : 5/7
c = -11/5/7
c = -77/5
c = -77/5
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