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