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m in (-oo:+oo)
2-(4*m)-(2*m) = -10 // + 10
2-(4*m)-(2*m)+10 = 0
2-4*m-2*m+10 = 0
12-6*m = 0 // - 12
-6*m = -12 // : -6
m = -12/(-6)
m = 2
m = 2
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