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m in (-oo:+oo)
4*(3*m-6) = 60 // - 60
4*(3*m-6)-60 = 0
4*(3*m-6)-60 = 0
12*m-84 = 0
12*m-84 = 0
12*m-84 = 0 // + 84
12*m = 84 // : 12
m = 84/12
m = 7
m = 7
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