f+15=21

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Solution for f+15=21 equation: 


Simplifying
f + 15 = 21

Reorder the terms:
15 + f = 21

Solving
15 + f = 21

Solving for variable 'f'.

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

Add '-15' to each side of the equation.
15 + -15 + f = 21 + -15

Combine like terms: 15 + -15 = 0
0 + f = 21 + -15
f = 21 + -15

Combine like terms: 21 + -15 = 6
f = 6

Simplifying
f = 6

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