If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-13f=-858
We move all terms to the left:
-13f-(-858)=0
We add all the numbers together, and all the variables
-13f+858=0
We move all terms containing f to the left, all other terms to the right
-13f=-858
f=-858/-13
f=+66
| -2+25x+17=-35,x | | -7x+2=-11x-54 | | 74=3y+1 | | -2=6/7j | | 11(b+18)-6(2b+1=4(-b+9) | | 5x-4(5x+29)=-26 | | 0.16=9x-0.74 | | 7n-4=21 | | -5(y+2)+3(3y-7)=3(y-4)+10 | | 6=-d/8 | | -6(6x+6)=216 | | 18x=1/2=6(3x+25 | | 3w^2=3w | | |5x^2-18x|=35 | | 9-9x/7=13 | | 37-4v=-5(1+5v) | | -2(7x-7)=-112 | | 8x+28=-16 | | 3k-14=3(k-5)+2 | | 9+x/7=15 | | 4=16/x-3 | | 9x-2x=3 | | 3(w-4)=6w-12 | | 9-6t+t²=25 | | 99=-h/3 | | X-9=21+4x | | 2b/5-3b/4=3 | | (y-4)/(2)=10 | | 11x-3=5x-13 | | 25-10x=2 | | 200=1.3x+.04x^2 | | -5x=-5x+7(x-3) |