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-10+f=10-9f
We move all terms to the left:
-10+f-(10-9f)=0
We add all the numbers together, and all the variables
f-(-9f+10)-10=0
We get rid of parentheses
f+9f-10-10=0
We add all the numbers together, and all the variables
10f-20=0
We move all terms containing f to the left, all other terms to the right
10f=20
f=20/10
f=2
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