If it's not what You are looking for type in the equation solver your own equation and let us solve it.
87=3f
We move all terms to the left:
87-(3f)=0
We move all terms containing f to the left, all other terms to the right
-3f=-87
f=-87/-3
f=+29
| 4900=700a | | 1=c/7−2 | | 19x-28=124 | | x=-60(3x) | | -4+x/21=-1 | | 2.3n+4.93=3n+2.6 | | 63x+30x+30x=4126 | | 3=r+6/4 | | 2-6m=-106 | | 49x^2+112x+64=25 | | 2=-10+x/4 | | 8(3+8m)=-296 | | 2/3x+8=x-10 | | 9x1=x13/7 | | 12x-44=52 | | X/2x=8/9 | | 32x^2-8x=0 | | 4.9x^2-23x+12=0 | | -86=2(5x-5)-6 | | 2(x+3)+x=3x+5 | | 5n+3-n+5=40 | | -8n+14+10n=3 | | 112=4(5x+8) | | -11(x-2)+8x=-8 | | 13x-27=90 | | 124=4(7-8b) | | 7(1+6x)=301 | | -8n+-4=-2+n+-6+-8n | | (x-3)3=8 | | 36x^2+12x+1=4 | | 327=7(8b-1)-2 | | 14x-11=101 |