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m in (-oo:+oo)
6.3*m = 4/5 // - 4/5
6.3*m-(4/5) = 0
6.3*m-4/5 = 0
6.3*m-4/5 = 0 // + 4/5
6.3*m = 4/5 // : 6.3
m = 4/5/6.3
m = 0.12698413
m = 0.12698413
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