If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
1/12 = 1/(2*x) // - 1/(2*x)
1/12-(1/(2*x)) = 0
(-1/2)*x^-1+1/12 = 0
-1/2*x^-1 = -1/12 // : -1/2
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
| 1/12=1/2x | | -8d+4-9d=-20 | | 25-3t=52 | | -9*(3/5)^x | | 24-10b=4 | | D=8-3.5 | | x-2(x-2+x+4)=36 | | u=5(2n+33)+9(n+1) | | 3w-10=-40 | | 9999=100 | | 12x+3y=114 | | -7(x+4)+2x+7=8x+11 | | 72f-48=-16 | | 18+23+x=180 | | -2(w+4)=2w-6+2(3w+2) | | u=4(18+33)+5(6+1) | | 25/20=x/12=x/12 | | 3x+5(3x+7)=18x+35 | | 2.2=11.8-1.2x | | 9/2.25=x/1.5 | | h=-16t^2+42t+18 | | 77y=19(4y+19) | | 1/6*42 | | u=4(3n+33)+5(n+1) | | 5x+20=3x+4x | | -sin^2(x)(-1-cot^2(x))= | | 3X-32=2x+19 | | 2w-4w=-16 | | 8(9f-6)=-16 | | 5(x-4)=9(x+1)+33 | | 3(4x+8)=4(3x+6) | | -15=8(6c-4) |