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m in (-oo:+oo)
(2/4)*(4*m-18) = 12 // - 12
(2/4)*(4*m-18)-12 = 0
1/2*(4*m-18)-12 = 0
1/2*(4*m-18)-12 = 0
2*m-21 = 0
2*m-21 = 0
2*m-21 = 0 // + 21
2*m = 21 // : 2
m = 21/2
m = 21/2
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