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13+40f=13+5f
We move all terms to the left:
13+40f-(13+5f)=0
We add all the numbers together, and all the variables
40f-(5f+13)+13=0
We get rid of parentheses
40f-5f-13+13=0
We add all the numbers together, and all the variables
35f=0
f=0/35
f=0
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