If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f=13=58
We move all terms to the left:
f-(13)=0
We move all terms containing f to the left, all other terms to the right
f=13
| -1-8k=-7k | | 21-7x=70 | | -39=2x+7 | | 10g-40+3g-g=7 | | 180-5x-12=x | | -20-9r=47 | | 24-12x=x | | -2x+13=-17 | | -3n+3=45 | | 3x-4=616 | | 40+2x+R=180 | | 1.1x+3.3=8.8 | | -6-2m=-4m | | 0.5y-7=5 | | -2(d+4)=-7 | | 4x+14=x-7 | | 6(65-x)+3.5x=340 | | 2x+x-15+78=180 | | 0.8h+16=0.7h+12 | | 3f=4+4f | | 2(12)-5+6y+1=180 | | h=1/29 | | 2(6+3x)+1=-5+3(x–1) | | 5f+12=8f-12 | | 4^{2x}-1=64 | | -6(2f+1)=78 | | 10n+6=-9n | | 23.2x+25.76=100 | | 4x+17+5+2x=44 | | -15-3(x+4)=18 | | 4(5e-10)=440 | | -10n+6=-9 |