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)
(2/3)*(12-x) = 0
2/3*(12-x) = 0
12-x = 0 // - 12
-x = -12 // * -1
x = 12
x = 12
| n^2+11n+10=0 | | (-7x+4)+(-7x^2+7x-9)= | | 100-9z=451 | | 2x-6=(x-1)+7 | | 3-(4x-1)-2(3x-1)=5 | | 13=3u-2 | | 1/3(12-6x)=5(x+4) | | 8x-4=6-2x | | 116-4x=14x+24 | | x^2+3n=2 | | K^2+15k=56 | | 6-2n=18 | | r(3-t)= | | -5*(3a+1)-11=-16 | | y=3x^2+21 | | a=3.14r(14) | | k-(-3/4)=11/12 | | x^2+49=400 | | 3b^2+6b^2= | | 6x=2-3x | | 5x=3(x-2)+1 | | (64x^9)^2/3 | | 6b/9+3c/9 | | 6+ln(8x)=24-2ln(x) | | 12-2*(k+3)=26 | | 4x-9=99 | | 4x-men= | | 10+8/4-12 | | 6(y-1)= | | -10t+60=60 | | 3x^2-15=57 | | x+1/3+x+2/7+2 |