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m in (-oo:+oo)
5*(m+8) = 50 // - 50
5*(m+8)-50 = 0
5*(m+8)-50 = 0
5*m-10 = 0
5*m-10 = 0
5*m-10 = 0 // + 10
5*m = 10 // : 5
m = 10/5
m = 2
m = 2
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