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8f+4-20=20+10f
We move all terms to the left:
8f+4-20-(20+10f)=0
We add all the numbers together, and all the variables
8f-(10f+20)+4-20=0
We add all the numbers together, and all the variables
8f-(10f+20)-16=0
We get rid of parentheses
8f-10f-20-16=0
We add all the numbers together, and all the variables
-2f-36=0
We move all terms containing f to the left, all other terms to the right
-2f=36
f=36/-2
f=-18
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