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m in (-oo:+oo)
8/9-((5*m)/9) = 23 // - 23
8/9-((5*m)/9)-23 = 0
(-5/9)*m+8/9-23 = 0
-5/9*m-199/9 = 0 // + 199/9
-5/9*m = 199/9 // : -5/9
m = 199/9/(-5/9)
m = -199/5
m = -199/5
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