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m in (-oo:+oo)
2*(3*m+8) = 64 // - 64
2*(3*m+8)-64 = 0
2*(3*m+8)-64 = 0
6*m-48 = 0
6*m-48 = 0
6*m-48 = 0 // + 48
6*m = 48 // : 6
m = 48/6
m = 8
m = 8
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