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m in (-oo:+oo)
8-(5*m)-(5*m) = -2 // + 2
2-(5*m)-(5*m)+8 = 0
2-5*m-5*m+8 = 0
10-10*m = 0 // - 10
-10*m = -10 // : -10
m = -10/(-10)
m = 1
m = 1
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