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m in (-oo:+oo)
2*m-m-(9/3) = 7/4 // - 7/4
2*m-m-(9/3)-(7/4) = 0
2*m-m-7/4-3 = 0
m-19/4 = 0 // + 19/4
m = 19/4
m = 19/4
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