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c in (-oo:+oo)
7/9 = c/36 // - c/36
7/9-(c/36) = 0
7/9-1/36*c = 0 // - 7/9
-1/36*c = -7/9 // : -1/36
c = -7/9/(-1/36)
c = 28
c = 28
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