If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
3-x = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:3) U (3:+oo)
(x^2-9)/(3-x) = 0
1*x^2 = 9 // : 1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3}
x = -3
| 9x-5=-3x+1 | | 6-11x=8x+19-3x+2 | | 9x-5=-3x+5 | | 20x-15=18x+7 | | (5y+2)/125=0 | | 8x=7(x+20) | | 5x+2-7x=10x+22 | | 3x+5x-x-3=2(2x)+3x-5 | | 45/20x=950 | | 0.05+0.1y=0.12+0.06y | | 0.05y+0.1=0.12y+0.06 | | z=9/13 | | x/100=239/72 | | 6.6(x-4)=0.4x+8.6 | | (3x)+(x/3)=15 | | x/100=72/239 | | 792x+10=14x-6 | | 12x-6x-2=2(5x)-2-4x | | y^2x-5= | | 9x+7=9x-8 | | 4x=-2+18 | | -x^2+2=7x | | 2x-4(x-4)=-5+3x-4 | | x/100=1088/1700 | | x+4/3=10/2 | | 5x-3x+3=-2x-7+4x | | -12x^7+18x^6-18/3x^6 | | 25c+15c^3=0 | | 3x+9y=78 | | 9y-8=5y | | -2(x-3)+2=-18 | | 4x+27=7x-36 |