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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
1/2-(10/m) > -1/5 // + -1/5
1/2-(10/m)-(-1/5) > 0
1/2-10*m^-1+1/5 > 0
-10*m^-1 > -7/10
-10*m^-1 > -7/10 // * -1
10*m^-1 < 7/10
10*m^-1 < 7/10 // : 10
m^-1 < 7/10/10
m^-1 < 7/100
1/(m^1) < 7/100
m <> 0
1/(m^1) < 7/100 // * m^2
(m^2)/(m^1) < 7/100*m^2
m^1 < 7/100*m^2
m-7/100*m^2 < 0
m^1*(1-7/100*m) < 0
m < 0
-(abs(m))^1*(7/100*(abs(m))^1+1) < 0 // : -(abs(m))^1
7/100*(abs(m))^1+1 > 0
7/100*(abs(m))^1 > -1 // : 7/100
(abs(m))^1 > -1/7/100
(abs(m))^1 > -100/7 // ^ 1/1
abs(m) > (-100/7)^(1/1)
abs(m) > -100/7
m in (-oo:0)
m < 0
m > 0
m^1*(1-(7/100*m^1)) < 0 // : m^1
1-(7/100*m^1) < 0
1 < 7/100*m^1 // : 7/100
1/7/100 < m^1 // ^ 1/1
(1/7/100)^(1/1) < m
m in (100/7:+oo)
m > 0
m in (-oo:0) U (100/7:+oo)
m in (-oo:0) U (100/7:+oo)
(-oo:0) U (100/7:+oo)
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