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27=22+f
We move all terms to the left:
27-(22+f)=0
We add all the numbers together, and all the variables
-(f+22)+27=0
We get rid of parentheses
-f-22+27=0
We add all the numbers together, and all the variables
-1f+5=0
We move all terms containing f to the left, all other terms to the right
-f=-5
f=-5/-1
f=+5
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