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c in (-oo:+oo)
(-2/9)*c = 3 // - 3
(-2/9)*c-3 = 0
-2/9*c-3 = 0 // + 3
-2/9*c = 3 // : -2/9
c = 3/(-2/9)
c = -27/2
c = -27/2
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