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m in (-oo:+oo)
15 = 6*m-4*m+5 // - 6*m-4*m+5
15-(-4*m)-(6*m)-5 = 0
4*m-6*m-5+15 = 0
10-2*m = 0 // - 10
-2*m = -10 // : -2
m = -10/(-2)
m = 5
m = 5
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