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20+10f=-10-5f
We move all terms to the left:
20+10f-(-10-5f)=0
We add all the numbers together, and all the variables
10f-(-5f-10)+20=0
We get rid of parentheses
10f+5f+10+20=0
We add all the numbers together, and all the variables
15f+30=0
We move all terms containing f to the left, all other terms to the right
15f=-30
f=-30/15
f=-2
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