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)
7/28 = 10/x // - 10/x
7/28-(10/x) = 0
7/28-10*x^-1 = 0
-10*x^-1 = -1/4 // : -10
x^-1 = 1/40
-1 < 0
1/(x^1) = 1/40 // * x^1
1 = 1/40*x^1 // : 1/40
40 = x^1
x = 40
x = 40
| 5/11*-3.1629 | | 3(2x+5)-2(4x+1)= | | 4y+8-2y-6= | | 300-9n= | | .15(x+50)-.07(x-20)=6.5 | | 4x+14=78+-4x | | 4(d-8)+7= | | -12+6w=18 | | 36=-8p+12 | | 4z+8.5=14.9 | | 300-20n= | | 28+8r=92 | | (5/3)/6 | | 60=24-12d | | 10x-15/6x-9 | | .5p=.66 | | 29x+3y=-7 | | 29x+3y=7 | | 49/10+10 | | -7/10*-7 | | 80-12t=38 | | (a/-3b^2)^2 | | -8+4u=-4 | | -3(6n-4)+18n= | | 7=7x+63 | | 4(d-6)+6= | | -2x^2-7x-2=0 | | 460=9/2L*2W | | 10y=5y+7+5y | | 11(x-2)-9=29x-85 | | -6(s+2)= | | (7m^2+60m-27)/(m+9) |