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m in (-oo:+oo)
1/2-((3*m)/4)+7 = 4*m-(m/28)-9 // - 4*m-(m/28)-9
m/28-((3*m)/4)-(4*m)+1/2+7+9 = 0
(-3/4)*m-4*m+m/28+1/2+7+9 = 0
33/2-33/7*m = 0 // - 33/2
-33/7*m = -33/2 // : -33/7
m = -33/2/(-33/7)
m = 7/2
m = 7/2
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