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f-7/9=2/9
We move all terms to the left:
f-7/9-(2/9)=0
We add all the numbers together, and all the variables
f-7/9-(+2/9)=0
We get rid of parentheses
f-7/9-2/9=0
We multiply all the terms by the denominator
f*9-7-2=0
We add all the numbers together, and all the variables
f*9-9=0
Wy multiply elements
9f-9=0
We move all terms containing f to the left, all other terms to the right
9f=9
f=9/9
f=1
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