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m in (-oo:+oo)
5*(1-(2*m)) = 25 // - 25
5*(1-(2*m))-25 = 0
5*(1-2*m)-25 = 0
5*(1-2*m)-25 = 0
-10*m-20 = 0
-10*m-20 = 0
-10*m-20 = 0 // + 20
-10*m = 20 // : -10
m = 20/(-10)
m = -2
m = -2
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