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m in (-oo:+oo)
1/2-m = (3/4)*m-11/20 // - (3/4)*m-11/20
1/2-m-((3/4)*m)-(-11/20) = 0
(-3/4)*m-m+1/2+11/20 = 0
21/20-7/4*m = 0 // - 21/20
-7/4*m = -21/20 // : -7/4
m = -21/20/(-7/4)
m = 3/5
m = 3/5
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