9=21-3f

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Solution for 9=21-3f equation:



9=21-3f
We move all terms to the left:
9-(21-3f)=0
We add all the numbers together, and all the variables
-(-3f+21)+9=0
We get rid of parentheses
3f-21+9=0
We add all the numbers together, and all the variables
3f-12=0
We move all terms containing f to the left, all other terms to the right
3f=12
f=12/3
f=4

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