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2f+2.6=8.78
We move all terms to the left:
2f+2.6-(8.78)=0
We add all the numbers together, and all the variables
2f-6.18=0
We move all terms containing f to the left, all other terms to the right
2f=6.18
f=6.18/2
f=3+0.18/2
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