If it's not what You are looking for type in the equation solver your own equation and let us solve it.
20=31f
We move all terms to the left:
20-(31f)=0
We move all terms containing f to the left, all other terms to the right
-31f=-20
f=-20/-31
f=20/31
| 4(7)-4x=16 | | 5(b+40-6b=-24 | | 7x-9=4x-5 | | 15t+84=67 | | 98+33+49=x | | 8=6+r2 | | 2x=2x=x | | (-7.2)y=61.2 | | (.25)(|x+7|)=8x+16 | | 30x+1.50=12+3x | | -3p-21=21 | | 70x-1=90 | | 7x+8=−41 | | 3x+3(7×+9)=-141 | | 7(-2x+5=28 | | 7.50p=33.75 | | c^2+9c+10=-2 | | -436=15x | | 4^x-11=0,25 | | 15-8p+6.75=10 | | Y=50+75x | | 12=(x-3)(2x-4)=12 | | 1/2-z/9=1/18 | | Y+3=3(x+15) | | -2(1+3v)-2(v-5)=v+4-7v | | 2a=7/4a | | 2/15y=1/5 | | 2a=7/4 | | 11=20x-9 | | 10x-17=7x+31 | | .2x=2.3 | | 5v^2+17v+5v=6v |