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m in (-oo:+oo)
-((3/4)*m)-4 = 5 // - 5
-((3/4)*m)-5-4 = 0
(-3/4)*m-5-4 = 0
-3/4*m-9 = 0 // + 9
-3/4*m = 9 // : -3/4
m = 9/(-3/4)
m = -12
m = -12
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