9+2f=45

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Solution for 9+2f=45 equation: 



9+2f=45

We move all terms to the left:

9+2f-(45)=0

We add all the numbers together, and all the variables

2f-36=0

We move all terms containing f to the left, all other terms to the right

2f=36

f=36/2

f=18

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