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m in (-oo:+oo)
0.5*m+7.5 = (3/4)*m // - (3/4)*m
0.5*m-((3/4)*m)+7.5 = 0
0.5*m+(-3/4)*m+7.5 = 0
7.5-0.25*m = 0 // - 7.5
-0.25*m = -7.5 // : -0.25
m = -7.5/(-0.25)
m = 30
m = 30
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