If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
-4/(-9) = f/(-12) // - f/(-12)
-(f/(-12))-4/(-9) = 0
1/12*f+4/9 = 0 // - 4/9
1/12*f = -4/9 // : 1/12
f = -4/9/1/12
f = -16/3
f = -16/3
| 12(x-1/2)-4x=26,8 | | -5u=9-8u | | (x^2-7)/(x^2-x-6)1 | | 12(x-1/2)ñ- | | 2n-42=-18 | | 5-4+7x+1=4x+9 | | 2g+4g+3g-4g+10h=5g+10h | | 6.7-4.7m=3(2m-1) | | 2x+4y+21z= | | 8-5w=-8w-10 | | X^3+3x^2-30=0 | | 2x^3-7x^2-7x+12= | | 8k=6+7k | | 9x^4-3x^2-4=0 | | 4876(7899554556669+9+9+9544484884484826262662595x)=555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555x+10 | | -6+s=3s+4 | | -2z+10=-z | | 4x^2-16x+152=0 | | -6-6u=-7u | | 3y-1=6x-13 | | 135879(4559p)+-54889645654=468p(88684477) | | p+15=-78 | | 9h=7h-6 | | 6x^3+x-26=0 | | 20.5*2.4= | | -(3-7x)=9+5x | | -1/3s=12 | | 7(3x-4)=5 | | 99=r+4 | | x^2+10x+17=13x+5 | | 3(2x+3)=10x+4-4x+5 | | 7-(5-8x)=4x+4 |