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10f+4=-9-3f
We move all terms to the left:
10f+4-(-9-3f)=0
We add all the numbers together, and all the variables
10f-(-3f-9)+4=0
We get rid of parentheses
10f+3f+9+4=0
We add all the numbers together, and all the variables
13f+13=0
We move all terms containing f to the left, all other terms to the right
13f=-13
f=-13/13
f=-1
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