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m in (-oo:+oo)
(-8/5)*m = 7 // - 7
(-8/5)*m-7 = 0
-8/5*m-7 = 0 // + 7
-8/5*m = 7 // : -8/5
m = 7/(-8/5)
m = -35/8
m = -35/8
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