15=f+57

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Solution for 15=f+57 equation:


Simplifying
15 = f + 57

Reorder the terms:
15 = 57 + f

Solving
15 = 57 + f

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.
15 + -1f = 57 + f + -1f

Combine like terms: f + -1f = 0
15 + -1f = 57 + 0
15 + -1f = 57

Add '-15' to each side of the equation.
15 + -15 + -1f = 57 + -15

Combine like terms: 15 + -15 = 0
0 + -1f = 57 + -15
-1f = 57 + -15

Combine like terms: 57 + -15 = 42
-1f = 42

Divide each side by '-1'.
f = -42

Simplifying
f = -42

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