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m in (-oo:+oo)
(2-m)/(-5) = -1 // + 1
(2-m)/(-5)+1 = 0
(2-m)/(-5)+(-5*1)/(-5) = 0
2-m-5*1 = 0
-m-3 = 0
(-m-3)/(-5) = 0
(-m-3)/(-5) = 0 // * -5
-m-3 = 0
-m-3 = 0 // + 3
-m = 3 // * -1
m = -3
m = -3
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