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9=f+28/9
We move all terms to the left:
9-(f+28/9)=0
We add all the numbers together, and all the variables
-(+f+28/9)+9=0
We get rid of parentheses
-f+9-28/9=0
We multiply all the terms by the denominator
-f*9-28+9*9=0
We add all the numbers together, and all the variables
-f*9+53=0
Wy multiply elements
-9f+53=0
We move all terms containing f to the left, all other terms to the right
-9f=-53
f=-53/-9
f=5+8/9
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