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m in (-oo:+oo)
5*(10-(2*m)) = 50 // - 50
5*(10-(2*m))-50 = 0
5*(10-2*m)-50 = 0
5*(10-2*m)-50 = 0
-10*m = 0
-10*m = 0
-10*m = 0 // : -10
m = 0
m = 0
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