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-20-2+15f=14+6f
We move all terms to the left:
-20-2+15f-(14+6f)=0
We add all the numbers together, and all the variables
15f-(6f+14)-20-2=0
We add all the numbers together, and all the variables
15f-(6f+14)-22=0
We get rid of parentheses
15f-6f-14-22=0
We add all the numbers together, and all the variables
9f-36=0
We move all terms containing f to the left, all other terms to the right
9f=36
f=36/9
f=4
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