9+f+2f=12

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Solution for 9+f+2f=12 equation: 


Simplifying
9 + f + 2f = 12

Combine like terms: f + 2f = 3f
9 + 3f = 12

Solving
9 + 3f = 12

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 = 12 + -9

Combine like terms: 9 + -9 = 0
0 + 3f = 12 + -9
3f = 12 + -9

Combine like terms: 12 + -9 = 3
3f = 3

Divide each side by '3'.
f = 1

Simplifying
f = 1

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