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m in (-oo:+oo)
m-((4/7)*m)-9 = -51/7 // + -51/7
m-((4/7)*m)-(-51/7)-9 = 0
(-4/7)*m+m+51/7-9 = 0
3/7*m-12/7 = 0 // + 12/7
3/7*m = 12/7 // : 3/7
m = 12/7/3/7
m = 4
m = 4
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