(f-1)-2f=-2(3+f)

Solution for (f-1)-2f=-2(3+f) equation:

Simplifying
(f + -1) + -2f = -2(3 + f)

Reorder the terms:
(-1 + f) + -2f = -2(3 + f)

Remove parenthesis around (-1 + f)
-1 + f + -2f = -2(3 + f)

Combine like terms: f + -2f = -1f
-1 + -1f = -2(3 + f)
-1 + -1f = (3 * -2 + f * -2)
-1 + -1f = (-6 + -2f)

Solving
-1 + -1f = -6 + -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.
-1 + -1f + 2f = -6 + -2f + 2f

Combine like terms: -1f + 2f = 1f
-1 + 1f = -6 + -2f + 2f

Combine like terms: -2f + 2f = 0
-1 + 1f = -6 + 0
-1 + 1f = -6

Add '1' to each side of the equation.
-1 + 1 + 1f = -6 + 1

Combine like terms: -1 + 1 = 0
0 + 1f = -6 + 1
1f = -6 + 1

Combine like terms: -6 + 1 = -5
1f = -5

Divide each side by '1'.
f = -5

Simplifying
f = -5