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m in (-oo:+oo)
(1/2)*(m-2) = 4 // - 4
(1/2)*(m-2)-4 = 0
1/2*(m-2)-4 = 0
1/2*(m-2)-4 = 0
1/2*m-5 = 0
1/2*m-5 = 0
1/2*m-5 = 0 // + 5
1/2*m = 5 // : 1/2
m = 5/1/2
m = 10
m = 10
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