If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
(1/3)*x-6 = 12 // - 12
(1/3)*x-12-6 = 0
1/3*x-18 = 0 // + 18
1/3*x = 18 // : 1/3
x = 18/1/3
x = 54
x = 54
| -6-x=2.5 | | 30+2x+x=180 | | -90x=60x+(-3500) | | -8+v/3=4 | | 15.1-r=8.9 | | 0.9n-19+n=2n-10-0.4n | | 1.7x=9.52 | | F(x)=3x^2-22x+24 | | M+1.819=6.519 | | -3b(b-8)=0 | | 1.7=9.52 | | 5.9+k=6.8 | | (k-6)(7k-2)=0 | | H-0.5=9.7 | | 4x^2+76x+93=0 | | G+1.8=4.2 | | (4g+3)(4g+3)=0 | | x*0.13-0.10=106 | | X+4x+7x=180 | | -9fg-10fh+5f-1=-2g-9 | | n=45 | | 5x^6y^8+10x^7y^7= | | 8+7*5= | | 2/3x+8=1/2x+10 | | (x*0.13)-0.10=106 | | -12-2x=-24 | | k^2-19k+90= | | log(8)-2x+log(8)6=log(8)78 | | 50-5x=3x-6 | | x^2y(y^2-3x+5)= | | 16-7x=21x | | b^2-9b= |