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