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c in (-oo:+oo)
2/3 = (8/9)*c // - (8/9)*c
2/3-((8/9)*c) = 0
(-8/9)*c+2/3 = 0
2/3-8/9*c = 0 // - 2/3
-8/9*c = -2/3 // : -8/9
c = -2/3/(-8/9)
c = 3/4
c = 3/4
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