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c in (-oo:+oo)
2/3 = (5/7)*c // - (5/7)*c
2/3-((5/7)*c) = 0
(-5/7)*c+2/3 = 0
2/3-5/7*c = 0 // - 2/3
-5/7*c = -2/3 // : -5/7
c = -2/3/(-5/7)
c = 14/15
c = 14/15
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