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710=f+-209
We move all terms to the left:
710-(f+-209)=0
We add all the numbers together, and all the variables
-(f-209)+710=0
We get rid of parentheses
-f+209+710=0
We add all the numbers together, and all the variables
-1f+919=0
We move all terms containing f to the left, all other terms to the right
-f=-919
f=-919/-1
f=+919
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