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m in (-oo:+oo)
-(5*m)-4 = -56/9 // + -56/9
-(5*m)-(-56/9)-4 = 0
56/9-5*m-4 = 0
20/9-5*m = 0 // - 20/9
-5*m = -20/9 // : -5
m = -20/9/(-5)
m = 4/9
m = 4/9
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