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m in (-oo:+oo)
2*(m/4+6) = 2 // - 2
2*(m/4+6)-2 = 0
2*(1/4*m+6)-2 = 0
2*(1/4*m+6)-2 = 0
1/2*m+10 = 0
1/2*m+10 = 0
1/2*m+10 = 0 // - 10
1/2*m = -10 // : 1/2
m = -10/1/2
m = -20
m = -20
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