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6.4+2f=9.38
We move all terms to the left:
6.4+2f-(9.38)=0
We add all the numbers together, and all the variables
2f-2.98=0
We move all terms containing f to the left, all other terms to the right
2f=2.98
f=2.98/2
f=1+0.98/2
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