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m in (-oo:+oo)
97/28 = 6*m-m-(2/7) // - 6*m-m-(2/7)
m-(6*m)+97/28+2/7 = 0
m-6*m+97/28+2/7 = 0
15/4-5*m = 0 // - 15/4
-5*m = -15/4 // : -5
m = -15/4/(-5)
m = 3/4
m = 3/4
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