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m in (-oo:+oo)
2*m-(9/7) = 4 // - 4
2*m-(9/7)-4 = 0
2*m-9/7-4 = 0
2*m-37/7 = 0 // + 37/7
2*m = 37/7 // : 2
m = 37/7/2
m = 37/14
m = 37/14
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