f+18=31

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Solution for f+18=31 equation: 


Simplifying
f + 18 = 31

Reorder the terms:
18 + f = 31

Solving
18 + f = 31

Solving for variable 'f'.

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

Add '-18' to each side of the equation.
18 + -18 + f = 31 + -18

Combine like terms: 18 + -18 = 0
0 + f = 31 + -18
f = 31 + -18

Combine like terms: 31 + -18 = 13
f = 13

Simplifying
f = 13

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