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(12)=0.5F+3
We move all terms to the left:
(12)-(0.5F+3)=0
We get rid of parentheses
-0.5F-3+12=0
We add all the numbers together, and all the variables
-0.5F+9=0
We move all terms containing F to the left, all other terms to the right
-0.5F=-9
F=-9/-0.5
F=+18
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