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m in (-oo:+oo)
5*(5-(2*m)) = 125 // - 125
5*(5-(2*m))-125 = 0
5*(5-2*m)-125 = 0
5*(5-2*m)-125 = 0
-10*m-100 = 0
-10*m-100 = 0
-10*m-100 = 0 // + 100
-10*m = 100 // : -10
m = 100/(-10)
m = -10
m = -10
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