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(20)=0.50F+4
We move all terms to the left:
(20)-(0.50F+4)=0
We get rid of parentheses
-0.50F-4+20=0
We add all the numbers together, and all the variables
-0.5F+16=0
We move all terms containing F to the left, all other terms to the right
-0.5F=-16
F=-16/-0.5
F=+32
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