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2.8f=-1.2f-10.8
We move all terms to the left:
2.8f-(-1.2f-10.8)=0
We get rid of parentheses
2.8f+1.2f+10.8=0
We add all the numbers together, and all the variables
4f+10.8=0
We move all terms containing f to the left, all other terms to the right
4f=-10.8
f=-10.8/4
f=-2+1/1.42857142857
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