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m in (-oo:+oo)
9-((2*m)/7) = 19 // - 19
9-((2*m)/7)-19 = 0
(-2/7)*m-19+9 = 0
-2/7*m-10 = 0 // + 10
-2/7*m = 10 // : -2/7
m = 10/(-2/7)
m = -35
m = -35
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