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m in (-oo:+oo)
4*m-(1/10) = 7/30 // - 7/30
4*m-(1/10)-(7/30) = 0
4*m-1/10-7/30 = 0
4*m-1/3 = 0 // + 1/3
4*m = 1/3 // : 4
m = 1/3/4
m = 1/12
m = 1/12
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