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f=-19-9f
We move all terms to the left:
f-(-19-9f)=0
We add all the numbers together, and all the variables
f-(-9f-19)=0
We get rid of parentheses
f+9f+19=0
We add all the numbers together, and all the variables
10f+19=0
We move all terms containing f to the left, all other terms to the right
10f=-19
f=-19/10
f=-1+9/10
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