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-20-3f=10f-16f+16
We move all terms to the left:
-20-3f-(10f-16f+16)=0
We add all the numbers together, and all the variables
-3f-(-6f+16)-20=0
We get rid of parentheses
-3f+6f-16-20=0
We add all the numbers together, and all the variables
3f-36=0
We move all terms containing f to the left, all other terms to the right
3f=36
f=36/3
f=12
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