126=f+87

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Solution for 126=f+87 equation:


Simplifying
126 = f + 87

Reorder the terms:
126 = 87 + f

Solving
126 = 87 + 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.
126 + -1f = 87 + f + -1f

Combine like terms: f + -1f = 0
126 + -1f = 87 + 0
126 + -1f = 87

Add '-126' to each side of the equation.
126 + -126 + -1f = 87 + -126

Combine like terms: 126 + -126 = 0
0 + -1f = 87 + -126
-1f = 87 + -126

Combine like terms: 87 + -126 = -39
-1f = -39

Divide each side by '-1'.
f = 39

Simplifying
f = 39

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