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m in (-oo:+oo)
2-((4*m)/5) = 6 // - 6
2-((4*m)/5)-6 = 0
(-4/5)*m-6+2 = 0
-4/5*m-4 = 0 // + 4
-4/5*m = 4 // : -4/5
m = 4/(-4/5)
m = -5
m = -5
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