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8+4f=20+15=f
We move all terms to the left:
8+4f-(20+15)=0
We add all the numbers together, and all the variables
4f+8-35=0
We add all the numbers together, and all the variables
4f-27=0
We move all terms containing f to the left, all other terms to the right
4f=27
f=27/4
f=6+3/4
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