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m in (-oo:+oo)
-25/2 = (-1/2)*m+4*m+5 // - (-1/2)*m+4*m+5
-((-1/2)*m)-(4*m)-25/2-5 = 0
(1/2)*m-4*m-25/2-5 = 0
-7/2*m-35/2 = 0 // + 35/2
-7/2*m = 35/2 // : -7/2
m = 35/2/(-7/2)
m = -5
m = -5
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