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m in (-oo:+oo)
9-((2*m)/5) = 7 // - 7
9-((2*m)/5)-7 = 0
(-2/5)*m-7+9 = 0
2-2/5*m = 0 // - 2
-2/5*m = -2 // : -2/5
m = -2/(-2/5)
m = 5
m = 5
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