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(F)=900-9F
We move all terms to the left:
(F)-(900-9F)=0
We add all the numbers together, and all the variables
F-(-9F+900)=0
We get rid of parentheses
F+9F-900=0
We add all the numbers together, and all the variables
10F-900=0
We move all terms containing F to the left, all other terms to the right
10F=900
F=900/10
F=90
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