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-13f-19-9=-5f+20
We move all terms to the left:
-13f-19-9-(-5f+20)=0
We add all the numbers together, and all the variables
-13f-(-5f+20)-28=0
We get rid of parentheses
-13f+5f-20-28=0
We add all the numbers together, and all the variables
-8f-48=0
We move all terms containing f to the left, all other terms to the right
-8f=48
f=48/-8
f=-6
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