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m in (-oo:+oo)
10*m-(2/5) = (9/3)/5 // - (9/3)/5
10*m-(2/5)-((9/3)/5) = 0
10*m-2/5-3/5 = 0
10*m-1 = 0 // + 1
10*m = 1 // : 10
m = 1/10
m = 1/10
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