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5f+7=-14+8f
We move all terms to the left:
5f+7-(-14+8f)=0
We add all the numbers together, and all the variables
5f-(8f-14)+7=0
We get rid of parentheses
5f-8f+14+7=0
We add all the numbers together, and all the variables
-3f+21=0
We move all terms containing f to the left, all other terms to the right
-3f=-21
f=-21/-3
f=+7
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