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m in (-oo:+oo)
5*(6*m+1) = 155 // - 155
5*(6*m+1)-155 = 0
5*(6*m+1)-155 = 0
30*m-150 = 0
30*m-150 = 0
30*m-150 = 0 // + 150
30*m = 150 // : 30
m = 150/30
m = 5
m = 5
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