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10f-35=-5-20f
We move all terms to the left:
10f-35-(-5-20f)=0
We add all the numbers together, and all the variables
10f-(-20f-5)-35=0
We get rid of parentheses
10f+20f+5-35=0
We add all the numbers together, and all the variables
30f-30=0
We move all terms containing f to the left, all other terms to the right
30f=30
f=30/30
f=1
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