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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7-(3/m) > 18/m // - 18/m
7-(3/m)-(18/m) > 0
7-3*m^-1-18*m^-1 > 0
-21*m^-1 > -7
-21*m^-1 > -7 // * -1
21*m^-1 < 7
21*m^-1 < 7 // : 21
m^-1 < 7/21
m^-1 < 1/3
1/(m^1) < 1/3
m <> 0
1/(m^1) < 1/3 // * m^2
(m^2)/(m^1) < 1/3*m^2
m^1 < 1/3*m^2
m-1/3*m^2 < 0
m^1*(1-1/3*m) < 0
m < 0
-(abs(m))^1*(1/3*(abs(m))^1+1) < 0 // : -(abs(m))^1
1/3*(abs(m))^1+1 > 0
1/3*(abs(m))^1 > -1 // : 1/3
(abs(m))^1 > -1/1/3
(abs(m))^1 > -3 // ^ 1/1
abs(m) > (-3)^(1/1)
abs(m) > -3
m in (-oo:0)
m < 0
m > 0
m^1*(1-(1/3*m^1)) < 0 // : m^1
1-(1/3*m^1) < 0
1 < 1/3*m^1 // : 1/3
1/1/3 < m^1 // ^ 1/1
(1/1/3)^(1/1) < m
m in (3:+oo)
m > 0
m in (-oo:0) U (3:+oo)
m in (-oo:0) U (3:+oo)
(-oo:0) U (3:+oo)
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