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m in (-oo:+oo)
3/4-((1/6)*m) = (2/3)*m // - (2/3)*m
3/4-((1/6)*m)-((2/3)*m) = 0
(-1/6)*m+(-2/3)*m+3/4 = 0
3/4-5/6*m = 0 // - 3/4
-5/6*m = -3/4 // : -5/6
m = -3/4/(-5/6)
m = 9/10
m = 9/10
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