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(1000)=7.5F-20000
We move all terms to the left:
(1000)-(7.5F-20000)=0
We get rid of parentheses
-7.5F+20000+1000=0
We add all the numbers together, and all the variables
-7.5F+21000=0
We move all terms containing F to the left, all other terms to the right
-7.5F=-21000
F=-21000/-7.5
F=+2800
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