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30=3f+5f+6
We move all terms to the left:
30-(3f+5f+6)=0
We add all the numbers together, and all the variables
-(8f+6)+30=0
We get rid of parentheses
-8f-6+30=0
We add all the numbers together, and all the variables
-8f+24=0
We move all terms containing f to the left, all other terms to the right
-8f=-24
f=-24/-8
f=+3
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