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m in (-oo:+oo)
(-3/8)*m-((13/8)*m)+1 = 5 // - 5
(-3/8)*m-((13/8)*m)-5+1 = 0
(-3/8)*m+(-13/8)*m-5+1 = 0
-2*m-4 = 0 // + 4
-2*m = 4 // : -2
m = 4/(-2)
m = -2
m = -2
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