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7f+29=28f+22
We move all terms to the left:
7f+29-(28f+22)=0
We get rid of parentheses
7f-28f-22+29=0
We add all the numbers together, and all the variables
-21f+7=0
We move all terms containing f to the left, all other terms to the right
-21f=-7
f=-7/-21
f=1/3
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