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91=100-9f
We move all terms to the left:
91-(100-9f)=0
We add all the numbers together, and all the variables
-(-9f+100)+91=0
We get rid of parentheses
9f-100+91=0
We add all the numbers together, and all the variables
9f-9=0
We move all terms containing f to the left, all other terms to the right
9f=9
f=9/9
f=1
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