f+9=13

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Solution for f+9=13 equation: 


Simplifying
f + 9 = 13

Reorder the terms:
9 + f = 13

Solving
9 + f = 13

Solving for variable 'f'.

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

Add '-9' to each side of the equation.
9 + -9 + f = 13 + -9

Combine like terms: 9 + -9 = 0
0 + f = 13 + -9
f = 13 + -9

Combine like terms: 13 + -9 = 4
f = 4

Simplifying
f = 4

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