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(5)=12F-3+F
We move all terms to the left:
(5)-(12F-3+F)=0
We add all the numbers together, and all the variables
-(13F-3)+5=0
We get rid of parentheses
-13F+3+5=0
We add all the numbers together, and all the variables
-13F+8=0
We move all terms containing F to the left, all other terms to the right
-13F=-8
F=-8/-13
F=8/13
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