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15f=15+14f
We move all terms to the left:
15f-(15+14f)=0
We add all the numbers together, and all the variables
15f-(14f+15)=0
We get rid of parentheses
15f-14f-15=0
We add all the numbers together, and all the variables
f-15=0
We move all terms containing f to the left, all other terms to the right
f=15
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