If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-7 > 0
10*x^-1 > 7
10*x^-1 > 7 // : 10
x^-1 > 7/10
1/(x^1) > 7/10
x <> 0
1/(x^1) > 7/10 // * x^2
(x^2)/(x^1) > 7/10*x^2
x^1 > 7/10*x^2
x-7/10*x^2 > 0
x^1*(1-7/10*x) > 0
x < 0
-(abs(x))^1*(7/10*(abs(x))^1+1) > 0 // : -(abs(x))^1
7/10*(abs(x))^1+1 < 0
7/10*(abs(x))^1 < -1 // : 7/10
(abs(x))^1 < -1/7/10
(abs(x))^1 < -10/7 // ^ 1/1
abs(x) < (-10/7)^(1/1)
abs(x) < -10/7
x belongs to the empty set
x < 0
x > 0
x^1*(1-(7/10*x^1)) > 0 // : x^1
1-(7/10*x^1) > 0
1 > 7/10*x^1 // : 7/10
1/7/10 > x^1 // ^ 1/1
(1/7/10)^(1/1) > x
x in (0:10/7)
x > 0
x in (0:10/7)
x in (0:10/7)
(0:10/7)
| D=2*x^4-16*x^3+49*x^2-70*x+37 | | 6x^2-9=-15x | | 20/27/2/3 | | 44+42x=50x | | (5/x)=(3/10) | | 104=4(5-v)+4+v | | 9m+2+m=42 | | 20(x)=70+10x | | 4(2a+6)+7=5(3a+2)-3a-19 | | 8x+5.04=4x+11 | | 120=5x+20*2x | | 7=12y-5y | | .33(x+6)=.5(x-3) | | s-10=20.78 | | 4y^2-11y+21=0 | | 7p-(3p+4)=2(2p-1)-2 | | -6x-y=4 | | 13-ax=1-x | | 5x/12-4x/18 | | 22+-8x=4+-2x | | f(x)=2x^2-16x+29 | | h=288-16t^2 | | 18+6x=4y+16 | | 8b-6=-22 | | c=5f/9-32 | | 3(7x+4)=30-3x | | 7=-15-2y | | 15x+7th=80 | | 4x-18=-38-3x | | 8(0.04m+26.90+0.10(26.90))=260.40 | | 8b-6=-22 | | 7.91x+79.1=158.2 |