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25+15f=30+25f
We move all terms to the left:
25+15f-(30+25f)=0
We add all the numbers together, and all the variables
15f-(25f+30)+25=0
We get rid of parentheses
15f-25f-30+25=0
We add all the numbers together, and all the variables
-10f-5=0
We move all terms containing f to the left, all other terms to the right
-10f=5
f=5/-10
f=-1/2
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