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40-f=41-10
We move all terms to the left:
40-f-(41-10)=0
We add all the numbers together, and all the variables
-f+40-31=0
We add all the numbers together, and all the variables
-1f+9=0
We move all terms containing f to the left, all other terms to the right
-f=-9
f=-9/-1
f=+9
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