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m in (-oo:+oo)
3*(2*m+7) = 75 // - 75
3*(2*m+7)-75 = 0
3*(2*m+7)-75 = 0
6*m-54 = 0
6*m-54 = 0
6*m-54 = 0 // + 54
6*m = 54 // : 6
m = 54/6
m = 9
m = 9
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