If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-2-3f=-20
We move all terms to the left:
-2-3f-(-20)=0
We add all the numbers together, and all the variables
-3f+18=0
We move all terms containing f to the left, all other terms to the right
-3f=-18
f=-18/-3
f=+6
| w*w-26*w-153=0 | | 3x+29=(x+7) | | -1-7m=-85 | | w*w+26*w-153=0 | | 4(x-2)=18-2x | | 4p+8=40 | | 2c+10=6 | | H=-16t2+2704 | | X2+10x+21=32 | | 9a-8=81 | | 5x+3(7x+17)=207 | | 8v+20=13v | | k*k+8*k-84=0 | | 24^2-2x-15=0 | | 0.5x-1=-2x-6 | | d-356=11 | | 57+19=t | | 1/2x-1=-2x-6 | | 24w-36=12 | | 1/4(n+3)=9 | | -5y-6(-6-24)=0 | | 2x=3.88 | | h*h+28*h-3=0 | | 4^3x=9^2x | | b*b-16*b+64-19=0 | | -4(72-5b)=12b | | 180°=30°+x°+180°-(30°+x°) | | 10p-3=2(12+4)=7 | | 2x^2-7x-63=0 | | m+2=m−215 | | 10p-3=(12+4p)=7 | | 5/x-7=-4 |