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25+10f=5+15f
We move all terms to the left:
25+10f-(5+15f)=0
We add all the numbers together, and all the variables
10f-(15f+5)+25=0
We get rid of parentheses
10f-15f-5+25=0
We add all the numbers together, and all the variables
-5f+20=0
We move all terms containing f to the left, all other terms to the right
-5f=-20
f=-20/-5
f=+4
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