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2f-4.12+f=90
We move all terms to the left:
2f-4.12+f-(90)=0
We add all the numbers together, and all the variables
3f-94.12=0
We move all terms containing f to the left, all other terms to the right
3f=94.12
f=94.12/3
f=31+1/2.6785714285714
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