5f+15=3f+31

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Solution for 5f+15=3f+31 equation: 



5f+15=3f+31

We move all terms to the left:

5f+15-(3f+31)=0

We get rid of parentheses

5f-3f-31+15=0

We add all the numbers together, and all the variables

2f-16=0

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

2f=16

f=16/2

f=8

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