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m in (-oo:+oo)
5*(2*m-2) = 50 // - 50
5*(2*m-2)-50 = 0
5*(2*m-2)-50 = 0
10*m-60 = 0
10*m-60 = 0
10*m-60 = 0 // + 60
10*m = 60 // : 10
m = 60/10
m = 6
m = 6
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