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-178=f+-671
We move all terms to the left:
-178-(f+-671)=0
We add all the numbers together, and all the variables
-(f-671)-178=0
We get rid of parentheses
-f+671-178=0
We add all the numbers together, and all the variables
-1f+493=0
We move all terms containing f to the left, all other terms to the right
-f=-493
f=-493/-1
f=+493
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