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m in (-oo:+oo)
5*(2*m-8) = 40 // - 40
5*(2*m-8)-40 = 0
5*(2*m-8)-40 = 0
10*m-80 = 0
10*m-80 = 0
10*m-80 = 0 // + 80
10*m = 80 // : 10
m = 80/10
m = 8
m = 8
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