3f+1=f+9

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Solution for 3f+1=f+9 equation: 



3f+1=f+9

We move all terms to the left:

3f+1-(f+9)=0

We get rid of parentheses

3f-f-9+1=0

We add all the numbers together, and all the variables

2f-8=0

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

2f=8

f=8/2

f=4

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