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(4)=3F+15
We move all terms to the left:
(4)-(3F+15)=0
We get rid of parentheses
-3F-15+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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