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D( m )
2-m = 0
2-m = 0
2-m = 0
2-m = 0 // - 2
-m = -2 // * -1
m = 2
m in (-oo:2) U (2:+oo)
(m+2)/(2-m) = 3/4 // - 3/4
(m+2)/(2-m)-(3/4) = 0
(m+2)/(2-m)-3/4 = 0
(4*(m+2))/(4*(2-m))+(-3*(2-m))/(4*(2-m)) = 0
4*(m+2)-3*(2-m) = 0
7*m+2 = 0
(7*m+2)/(4*(2-m)) = 0
(7*m+2)/(4*(2-m)) = 0 // * 4*(2-m)
7*m+2 = 0
7*m+2 = 0 // - 2
7*m = -2 // : 7
m = -2/7
m = -2/7
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