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m in (-oo:+oo)
5*(1*m+5) = 65 // - 65
5*(1*m+5)-65 = 0
5*(m+5)-65 = 0
5*(m+5)-65 = 0
5*m-40 = 0
5*m-40 = 0
5*m-40 = 0 // + 40
5*m = 40 // : 5
m = 40/5
m = 8
m = 8
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