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m in (-oo:+oo)
7-((2/3)*m) = m+1/4 // - m+1/4
7-((2/3)*m)-m-(1/4) = 0
(-2/3)*m-m-1/4+7 = 0
27/4-5/3*m = 0 // - 27/4
-5/3*m = -27/4 // : -5/3
m = -27/4/(-5/3)
m = 81/20
m = 81/20
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