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