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m in (-oo:+oo)
7 = (1/2)*(-m-5) // - (1/2)*(-m-5)
7-((1/2)*(-m-5)) = 0
(-1/2)*(-m-5)+7 = 0
7-1/2*(-m-5) = 0
7-1/2*(-m-5) = 0
1/2*m+19/2 = 0
1/2*m+19/2 = 0
1/2*m+19/2 = 0 // - 19/2
1/2*m = -19/2 // : 1/2
m = -19/2/1/2
m = -19
m = -19
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