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15+2.99f=38.92
We move all terms to the left:
15+2.99f-(38.92)=0
We add all the numbers together, and all the variables
2.99f-23.92=0
We move all terms containing f to the left, all other terms to the right
2.99f=23.92
f=23.92/2.99
f=8
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