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m in (-oo:+oo)
7*m = 1/3 // - 1/3
7*m-(1/3) = 0
7*m-1/3 = 0
7*m-1/3 = 0 // + 1/3
7*m = 1/3 // : 7
m = 1/3/7
m = 1/21
m = 1/21
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