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m in (-oo:+oo)
12*m-(8/5) = 2*m // - 2*m
12*m-(2*m)-(8/5) = 0
12*m-2*m-8/5 = 0
10*m-8/5 = 0 // + 8/5
10*m = 8/5 // : 10
m = 8/5/10
m = 4/25
m = 4/25
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