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-6-6f+7=3f-9
We move all terms to the left:
-6-6f+7-(3f-9)=0
We add all the numbers together, and all the variables
-6f-(3f-9)+1=0
We get rid of parentheses
-6f-3f+9+1=0
We add all the numbers together, and all the variables
-9f+10=0
We move all terms containing f to the left, all other terms to the right
-9f=-10
f=-10/-9
f=1+1/9
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