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m in (-oo:+oo)
7*(5*m+8) = 161 // - 161
7*(5*m+8)-161 = 0
7*(5*m+8)-161 = 0
35*m-105 = 0
35*m-105 = 0
35*m-105 = 0 // + 105
35*m = 105 // : 35
m = 105/35
m = 3
m = 3
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