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10.3-12.3f=-17.2f-18.12
We move all terms to the left:
10.3-12.3f-(-17.2f-18.12)=0
We get rid of parentheses
-12.3f+17.2f+18.12+10.3=0
We add all the numbers together, and all the variables
4.9f+28.42=0
We move all terms containing f to the left, all other terms to the right
4.9f=-28.42
f=-28.42/4.9
f=-5+2.0416666666667/2.5520833333333
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