-56=20-(-f)

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Solution for -56=20-(-f) equation:


Simplifying
-56 = 20 + -1(-1f)

Remove parenthesis around (-1f)
-56 = 20 + -1 * -1f

Multiply -1 * -1
-56 = 20 + 1f

Solving
-56 = 20 + 1f

Solving for variable 'f'.

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

Add '-1f' to each side of the equation.
-56 + -1f = 20 + 1f + -1f

Combine like terms: 1f + -1f = 0
-56 + -1f = 20 + 0
-56 + -1f = 20

Add '56' to each side of the equation.
-56 + 56 + -1f = 20 + 56

Combine like terms: -56 + 56 = 0
0 + -1f = 20 + 56
-1f = 20 + 56

Combine like terms: 20 + 56 = 76
-1f = 76

Divide each side by '-1'.
f = -76

Simplifying
f = -76

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