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25=4+3f
We move all terms to the left:
25-(4+3f)=0
We add all the numbers together, and all the variables
-(3f+4)+25=0
We get rid of parentheses
-3f-4+25=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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