f+21=36

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Solution for f+21=36 equation: 


Simplifying
f + 21 = 36

Reorder the terms:
21 + f = 36

Solving
21 + f = 36

Solving for variable 'f'.

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

Add '-21' to each side of the equation.
21 + -21 + f = 36 + -21

Combine like terms: 21 + -21 = 0
0 + f = 36 + -21
f = 36 + -21

Combine like terms: 36 + -21 = 15
f = 15

Simplifying
f = 15

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