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 = 30/x // - 30/x
10-(30/x) = 0
10-30*x^-1 = 0
-30*x^-1 = -10 // : -30
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
| 2(4z+2)-7=53 | | -3(x-2)=2(x-7) | | 67land-89land-90=67.9land+9 | | 3(x-2)=-3x+6 | | 13579x+56=6789x | | -2p-4=23 | | y=15x^2+x | | 3(x+20)=x+6 | | 1/4w=-1/6y | | 3xy-4=y-8 | | 3r^5+3r^4-90r^3= | | x^2+30=10x+6 | | X-2/3 | | 34x+45=89x | | (15-15)*w= | | 8v+48=5(v+6) | | 7q+3=9 | | 5/2-1/4 | | -4n=-100 | | -20=-4x-(-6x) | | 5-2x/4x-10 | | X-2/3-x+4/4=5 | | 7y+8=123(78y) | | 5z^2-14z+8=0 | | (x-10)(10x)=0 | | 4(x-5)+1+3x=-12 | | 2x+9x-3x=27+5 | | 678888=1234567890y | | -.25x+6=.66666666666666666666666667x+28 | | 11-10x=50-17x | | 6x+2=4x+22 | | .1(x+20)+.1x=3 |