-20=-7f+3f

Solution for -20=-7f+3f equation:

Simplifying
-20 = -7f + 3f

Combine like terms: -7f + 3f = -4f
-20 = -4f

Solving
-20 = -4f

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Add '4f' to each side of the equation.
-20 + 4f = -4f + 4f

Combine like terms: -4f + 4f = 0
-20 + 4f = 0

Add '20' to each side of the equation.
-20 + 20 + 4f = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 4f = 0 + 20
4f = 0 + 20

Combine like terms: 0 + 20 = 20
4f = 20

Divide each side by '4'.
f = 5

Simplifying
f = 5