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20=52-4f
We move all terms to the left:
20-(52-4f)=0
We add all the numbers together, and all the variables
-(-4f+52)+20=0
We get rid of parentheses
4f-52+20=0
We add all the numbers together, and all the variables
4f-32=0
We move all terms containing f to the left, all other terms to the right
4f=32
f=32/4
f=8
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