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7+2f-8=-11-3f+20
We move all terms to the left:
7+2f-8-(-11-3f+20)=0
We add all the numbers together, and all the variables
2f-(-3f+9)+7-8=0
We add all the numbers together, and all the variables
2f-(-3f+9)-1=0
We get rid of parentheses
2f+3f-9-1=0
We add all the numbers together, and all the variables
5f-10=0
We move all terms containing f to the left, all other terms to the right
5f=10
f=10/5
f=2
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