f-f+9f-(f-3)=f+f

Solution for f-f+9f-(f-3)=f+f equation:

Simplifying
f + -1f + 9f + -1(f + -3) = f + f

Reorder the terms:
f + -1f + 9f + -1(-3 + f) = f + f
f + -1f + 9f + (-3 * -1 + f * -1) = f + f
f + -1f + 9f + (3 + -1f) = f + f

Reorder the terms:
3 + f + -1f + 9f + -1f = f + f

Combine like terms: f + -1f = 0
3 + 0 + 9f + -1f = f + f
3 + 9f + -1f = f + f

Combine like terms: 9f + -1f = 8f
3 + 8f = f + f

Combine like terms: f + f = 2f
3 + 8f = 2f

Solving
3 + 8f = 2f

Solving for variable 'f'.

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

Add '-2f' to each side of the equation.
3 + 8f + -2f = 2f + -2f

Combine like terms: 8f + -2f = 6f
3 + 6f = 2f + -2f

Combine like terms: 2f + -2f = 0
3 + 6f = 0

Add '-3' to each side of the equation.
3 + -3 + 6f = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 6f = 0 + -3
6f = 0 + -3

Combine like terms: 0 + -3 = -3
6f = -3

Divide each side by '6'.
f = -0.5

Simplifying
f = -0.5