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m in (-oo:+oo)
3*(2*m+5) = 75 // - 75
3*(2*m+5)-75 = 0
3*(2*m+5)-75 = 0
6*m-60 = 0
6*m-60 = 0
6*m-60 = 0 // + 60
6*m = 60 // : 6
m = 60/6
m = 10
m = 10
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