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m in (-oo:+oo)
-45 = m/(-2)+4 // - m/(-2)+4
-(m/(-2))-45-4 = 0
1/2*m-49 = 0 // + 49
1/2*m = 49 // : 1/2
m = 49/1/2
m = 98
m = 98
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