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D( m )
m-3 = 0
m-3 = 0
m-3 = 0
m-3 = 0 // + 3
m = 3
m in (-oo:3) U (3:+oo)
3/14 = 15/(m-3) // - 15/(m-3)
3/14-(15/(m-3)) = 0
3/14-15*(m-3)^-1 = 0
3/14-15/(m-3) = 0
(-15*14)/(14*(m-3))+(3*(m-3))/(14*(m-3)) = 0
3*(m-3)-15*14 = 0
3*m-219 = 0
(3*m-219)/(14*(m-3)) = 0
(3*m-219)/(14*(m-3)) = 0 // * 14*(m-3)
3*m-219 = 0
3*m-219 = 0 // + 219
3*m = 219 // : 3
m = 219/3
m = 73
m = 73
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