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356-(f-23)=234
We move all terms to the left:
356-(f-23)-(234)=0
We add all the numbers together, and all the variables
-(f-23)+122=0
We get rid of parentheses
-f+23+122=0
We add all the numbers together, and all the variables
-1f+145=0
We move all terms containing f to the left, all other terms to the right
-f=-145
f=-145/-1
f=+145
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