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10-2f=-6-f+7
We move all terms to the left:
10-2f-(-6-f+7)=0
We add all the numbers together, and all the variables
-2f-(-1f+1)+10=0
We get rid of parentheses
-2f+1f-1+10=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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