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-3f-8=10-9f
We move all terms to the left:
-3f-8-(10-9f)=0
We add all the numbers together, and all the variables
-3f-(-9f+10)-8=0
We get rid of parentheses
-3f+9f-10-8=0
We add all the numbers together, and all the variables
6f-18=0
We move all terms containing f to the left, all other terms to the right
6f=18
f=18/6
f=3
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