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f+4/9=7/9
We move all terms to the left:
f+4/9-(7/9)=0
We add all the numbers together, and all the variables
f+4/9-(+7/9)=0
We get rid of parentheses
f+4/9-7/9=0
We multiply all the terms by the denominator
f*9+4-7=0
We add all the numbers together, and all the variables
f*9-3=0
Wy multiply elements
9f-3=0
We move all terms containing f to the left, all other terms to the right
9f=3
f=3/9
f=1/3
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