3f+9=42

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Solution for 3f+9=42 equation: 


Simplifying
3f + 9 = 42

Reorder the terms:
9 + 3f = 42

Solving
9 + 3f = 42

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 + 3f = 42 + -9

Combine like terms: 9 + -9 = 0
0 + 3f = 42 + -9
3f = 42 + -9

Combine like terms: 42 + -9 = 33
3f = 33

Divide each side by '3'.
f = 11

Simplifying
f = 11

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