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-10f=-3-9f
We move all terms to the left:
-10f-(-3-9f)=0
We add all the numbers together, and all the variables
-10f-(-9f-3)=0
We get rid of parentheses
-10f+9f+3=0
We add all the numbers together, and all the variables
-1f+3=0
We move all terms containing f to the left, all other terms to the right
-f=-3
f=-3/-1
f=+3
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