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73=31+2f
We move all terms to the left:
73-(31+2f)=0
We add all the numbers together, and all the variables
-(2f+31)+73=0
We get rid of parentheses
-2f-31+73=0
We add all the numbers together, and all the variables
-2f+42=0
We move all terms containing f to the left, all other terms to the right
-2f=-42
f=-42/-2
f=+21
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