If it's not what You are looking for type in the equation solver your own equation and let us solve it.
9f(f)+12f+4=0
We add all the numbers together, and all the variables
12f+9ff+4=0
We move all terms containing f to the left, all other terms to the right
12f+9ff=-4
| -y=-4.08 | | 11+9n-11=13 | | 4-3p=5p+6 | | y^2-36y-248=0 | | 7-4m=-37 | | 11=h8+5 | | y-20+y+12=22 | | 6(4q-9)=2 | | 970=70x+60 | | 75=70x+60 | | 7.5+13x=22.5+3x | | 3x-7+4x=x+3(4x-5) | | 30-82=p | | 4-13=15-x | | 5x-9=135 | | 3x+4(5x/6)+6(x+5x/6)=1 | | x=200.000+0.2x | | 8x-3x=250 | | 4/1/2=x/32 | | X+x(18/100)=59500 | | (-0.2X^(2)+240x)=0 | | 175/x=5 | | 1x+3x=28 | | (c-23)/2=(2c=5)/7 | | 8*4+x*x=46 | | j+8=6 | | j+5=1 | | 3=6g=7 | | 3/10=n-3/5 | | 9x(11x)=0 | | 6y+7=4 | | Y=250000+0.75x |