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-7+10f=-20-4f+13f
We move all terms to the left:
-7+10f-(-20-4f+13f)=0
We add all the numbers together, and all the variables
10f-(9f-20)-7=0
We get rid of parentheses
10f-9f+20-7=0
We add all the numbers together, and all the variables
f+13=0
We move all terms containing f to the left, all other terms to the right
f=-13
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