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m in (-oo:+oo)
5*m+10 = 70/9 // - 70/9
5*m-(70/9)+10 = 0
5*m-70/9+10 = 0
5*m+20/9 = 0 // - 20/9
5*m = -20/9 // : 5
m = -20/9/5
m = -4/9
m = -4/9
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