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m in (-oo:+oo)
(m^1)/2+9 = 7 // - 7
(m^1)/2-7+9 = 0
m/2-7+9 = 0
1/2*m+2 = 0 // - 2
1/2*m = -2 // : 1/2
m = -2/1/2
m = -4
m = -4
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