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-4.57-19.9f=-17.97+9.6f-2.7f
We move all terms to the left:
-4.57-19.9f-(-17.97+9.6f-2.7f)=0
We add all the numbers together, and all the variables
-19.9f-(6.9f-17.97)-4.57=0
We get rid of parentheses
-19.9f-6.9f+17.97-4.57=0
We add all the numbers together, and all the variables
-26.8f+13.4=0
We move all terms containing f to the left, all other terms to the right
-26.8f=-13.4
f=-13.4/-26.8
f=1/2
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