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-5-7f=-20-10f
We move all terms to the left:
-5-7f-(-20-10f)=0
We add all the numbers together, and all the variables
-7f-(-10f-20)-5=0
We get rid of parentheses
-7f+10f+20-5=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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