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(F)=6F-450
We move all terms to the left:
(F)-(6F-450)=0
We get rid of parentheses
F-6F+450=0
We add all the numbers together, and all the variables
-5F+450=0
We move all terms containing F to the left, all other terms to the right
-5F=-450
F=-450/-5
F=+90
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