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m in (-oo:+oo)
7*m-1/2 = 13/2 // - 13/2
7*m-1/2-(13/2) = 0
7*m-1/2-13/2 = 0
7*m-7 = 0 // + 7
7*m = 7 // : 7
m = 7/7
m = 1
m = 1
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