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m in (-oo:+oo)
6-((2/3)*m) = m+3/4 // - m+3/4
6-((2/3)*m)-m-(3/4) = 0
(-2/3)*m-m-3/4+6 = 0
21/4-5/3*m = 0 // - 21/4
-5/3*m = -21/4 // : -5/3
m = -21/4/(-5/3)
m = 63/20
m = 63/20
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