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m in (-oo:+oo)
(2*(m+1))/(-2) = 10/(-2) // - 10/(-2)
(2*(m+1))/(-2)-(10/(-2)) = 0
(2*(m+1))/(-2)+5 = 0
(2*(m+1))/(-2)+(-2*5)/(-2) = 0
2*(m+1)-2*5 = 0
2*m-8 = 0
(2*m-8)/(-2) = 0
(2*m-8)/(-2) = 0 // * -2
2*m-8 = 0
2*m-8 = 0 // + 8
2*m = 8 // : 2
m = 8/2
m = 4
m = 4
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