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10-f=-5-4f
We move all terms to the left:
10-f-(-5-4f)=0
We add all the numbers together, and all the variables
-f-(-4f-5)+10=0
We add all the numbers together, and all the variables
-1f-(-4f-5)+10=0
We get rid of parentheses
-1f+4f+5+10=0
We add all the numbers together, and all the variables
3f+15=0
We move all terms containing f to the left, all other terms to the right
3f=-15
f=-15/3
f=-5
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