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(4)=3F+-7
We move all terms to the left:
(4)-(3F+-7)=0
We add all the numbers together, and all the variables
-(3F-7)+4=0
We get rid of parentheses
-3F+7+4=0
We add all the numbers together, and all the variables
-3F+11=0
We move all terms containing F to the left, all other terms to the right
-3F=-11
F=-11/-3
F=3+2/3
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