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)
(9*x-27)/(3-x) = 0
9*x-27 = 0 // + 27
9*x = 27 // : 9
x = 27/9
x = 3
x in { 3}
x belongs to the empty set
| 0.2*x=32 | | 7(v-2)+4v=-3 | | 7m-30=19 | | -8x^2+6x+7=0 | | 5(w+5)+2w=-24 | | 6x^5-10x^2=0 | | 24=3x+6(x-8) | | 18t^2+53t-3=0 | | f(-1)=-2x^2-11x+6 | | -3.1-x=-4.1 | | 45x^2+69x+12=0 | | 13-a=15 | | -3x-2(-7x+10)=-141 | | 12/50=t/50 | | P-8=90 | | 9x-4y=-18 | | f(x)=-2x^2-11x+6 | | 6x=4(x+7) | | B+150=480 | | x^6=25x^4 | | x-2.8=19.2 | | (x-7)(2x-11)=150 | | (18-2)180= | | (x+2)(x+2)-4(x+2)=12 | | 7m-3=4 | | -3+8y=6 | | 3-5/6x | | 14-xi=7y+6i | | 6y-8=4 | | a-3+3=12 | | 0=12x^3-23x^2+5x | | f(-5)=4 |