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0.25+f=21.20
We move all terms to the left:
0.25+f-(21.20)=0
We add all the numbers together, and all the variables
f+0.25-(21.2)=0
We add all the numbers together, and all the variables
f-20.95=0
We move all terms containing f to the left, all other terms to the right
f=20.95
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