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-3 = 0
-x-3 = 0
-x-3 = 0
-x-3 = 0 // + 3
-x = 3 // * -1
x = -3
x in (-oo:-3) U (-3:+oo)
-8/(-x-3) = 2 // - 2
-8/(-x-3)-2 = 0
(-2*(-x-3))/(-x-3)-8/(-x-3) = 0
-2*(-x-3)-8 = 0
2*x-2 = 0
(2*x-2)/(-x-3) = 0
(2*x-2)/(-x-3) = 0 // * -x-3
2*x-2 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x = 1
| s+3/4=6 | | 14y-7=8y+5 | | 154=2(x+x+1)+3(x+2+x+3) | | 6b+3=-10+5b | | 5(2z-4)=148 | | log(7)0=x | | -3x-y+2z=7 | | 955=5[x+18] | | 322/46=c | | -1+4x-3x=2+2x | | -8.9-10.11=74.44 | | 3x-4=-2x+21 | | -39=8x+9 | | x^2+17x=70 | | 100=5e+172 | | -9x+[-27]=18 | | 6y+2(y-4)=5(y+1)-3 | | -3(n-7)+5n=18+2 | | 4x+105=3.5(70+x) | | 7x-7=5x+8 | | 3-2x=7x-8x | | 7x+8xsquared+3y= | | v-50=14-9 | | -56=-12+4i | | 5-2x-1=2x-12 | | 1/2+x=3/4(x-2) | | 19x+12=18x+13 | | 16-2b=6(8b-7) | | -5-7x=-8x-1 | | 8/3+3M/5=64/15 | | 7+4x-9=9 | | 11y-y/5y+3y |