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m in (-oo:+oo)
(1/2)*(m-6) = 4 // - 4
(1/2)*(m-6)-4 = 0
1/2*(m-6)-4 = 0
1/2*(m-6)-4 = 0
1/2*m-7 = 0
1/2*m-7 = 0
1/2*m-7 = 0 // + 7
1/2*m = 7 // : 1/2
m = 7/1/2
m = 14
m = 14
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