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m in (-oo:+oo)
1-4*m-(2*m) = -17 // + 17
1-4*m-(2*m)+17 = 0
1-4*m-2*m+17 = 0
18-6*m = 0 // - 18
-6*m = -18 // : -6
m = -18/(-6)
m = 3
m = 3
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