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-4-8f=-20-4f
We move all terms to the left:
-4-8f-(-20-4f)=0
We add all the numbers together, and all the variables
-8f-(-4f-20)-4=0
We get rid of parentheses
-8f+4f+20-4=0
We add all the numbers together, and all the variables
-4f+16=0
We move all terms containing f to the left, all other terms to the right
-4f=-16
f=-16/-4
f=+4
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